diff --git a/.gitignore b/.gitignore
index 45c35ff..cc5b38f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -515,8 +515,6 @@ nul
 /*.deb
 /*.dmg
 /*.AppImage
-/velopack-output-local-verify
-/velopack-output-local
 /test-aot-publish
 /.claude/worktrees
 
diff --git a/LanMountainDesktop.Launcher/CommandContext.cs b/LanMountainDesktop.Launcher/CommandContext.cs
index f3d1948..612263f 100644
--- a/LanMountainDesktop.Launcher/CommandContext.cs
+++ b/LanMountainDesktop.Launcher/CommandContext.cs
@@ -11,7 +11,6 @@ internal sealed class CommandContext
         "launch",
         "preview-splash",
         "preview-error",
-        "preview-update",
         "preview-oobe",
         "preview-debug"
     ];
diff --git a/LanMountainDesktop.Launcher/Models/ReleaseInfo.cs b/LanMountainDesktop.Launcher/Models/ReleaseInfo.cs
deleted file mode 100644
index b74348a..0000000
--- a/LanMountainDesktop.Launcher/Models/ReleaseInfo.cs
+++ /dev/null
@@ -1,24 +0,0 @@
-namespace LanMountainDesktop.Launcher.Models;
-
-/// <summary>
-/// GitHub Release 信息
-/// </summary>
-public sealed class ReleaseInfo
-{
-    public required string TagName { get; init; }
-    public required string Name { get; init; }
-    public required bool Prerelease { get; init; }
-    public required DateTime PublishedAt { get; init; }
-    public required List<ReleaseAsset> Assets { get; init; }
-    public string? Body { get; init; }
-}
-
-/// <summary>
-/// Release 资源文件
-/// </summary>
-public sealed class ReleaseAsset
-{
-    public required string Name { get; init; }
-    public required string BrowserDownloadUrl { get; init; }
-    public required long Size { get; init; }
-}
diff --git a/LanMountainDesktop.Launcher/Properties/launchSettings.json b/LanMountainDesktop.Launcher/Properties/launchSettings.json
index aa58061..1aa1b6d 100644
--- a/LanMountainDesktop.Launcher/Properties/launchSettings.json
+++ b/LanMountainDesktop.Launcher/Properties/launchSettings.json
@@ -41,14 +41,6 @@
         "DOTNET_ENVIRONMENT": "Development"
       }
     },
-    "Launcher (Preview Update)": {
-      "commandName": "Project",
-      "commandLineArgs": "preview-update",
-      "workingDirectory": "$(SolutionDir)",
-      "environmentVariables": {
-        "DOTNET_ENVIRONMENT": "Development"
-      }
-    },
     "Launcher (Preview OOBE)": {
       "commandName": "Project",
       "commandLineArgs": "preview-oobe",
diff --git a/LanMountainDesktop.Launcher/Shell/EntryHandlers/PreviewEntryHandler.cs b/LanMountainDesktop.Launcher/Shell/EntryHandlers/PreviewEntryHandler.cs
index 866b550..e12db89 100644
--- a/LanMountainDesktop.Launcher/Shell/EntryHandlers/PreviewEntryHandler.cs
+++ b/LanMountainDesktop.Launcher/Shell/EntryHandlers/PreviewEntryHandler.cs
@@ -22,9 +22,6 @@ internal static class PreviewEntryHandler
             case "preview-multi-instance":
                 RunMultiInstancePreview(desktop);
                 return true;
-            case "preview-update":
-                RunUpdatePreview(desktop);
-                return true;
             case "preview-oobe":
                 RunOobePreview(desktop);
                 return true;
@@ -60,14 +57,6 @@ internal static class PreviewEntryHandler
         _ = WaitForWindowCloseAsync(desktop, promptWindow);
     }
 
-    private static void RunUpdatePreview(IClassicDesktopStyleApplicationLifetime desktop)
-    {
-        var updateWindow = new UpdateWindow();
-        updateWindow.SetDebugMode(true);
-        updateWindow.Show();
-        _ = SimulateUpdatePreviewAsync(desktop, updateWindow);
-    }
-
     private static void RunOobePreview(IClassicDesktopStyleApplicationLifetime desktop)
     {
         var oobeWindow = new OobeWindow();
@@ -77,11 +66,10 @@ internal static class PreviewEntryHandler
 
     private static async Task SimulateSplashPreviewAsync(IClassicDesktopStyleApplicationLifetime desktop, SplashWindow window)
     {
-        var stages = new[] { "initializing", "update", "plugins", "launch", "ready" };
+        var stages = new[] { "initializing", "plugins", "launch", "ready" };
         var messages = new[]
         {
             Strings.Preview_SplashInitializing,
-            Strings.Preview_SplashCheckingUpdates,
             Strings.Preview_SplashCheckingPlugins,
             Strings.Preview_SplashLaunchingHost,
             Strings.Preview_SplashReady
@@ -98,20 +86,6 @@ internal static class PreviewEntryHandler
         await Dispatcher.UIThread.InvokeAsync(() => desktop.Shutdown(0));
     }
 
-    private static async Task SimulateUpdatePreviewAsync(IClassicDesktopStyleApplicationLifetime desktop, UpdateWindow window)
-    {
-        var stages = new[] { "verify", "extract", "apply", "plugins", "cleanup" };
-        for (var i = 0; i < stages.Length; i++)
-        {
-            window.Report(stages[i], string.Format(Strings.Preview_UpdateProcessing, stages[i]), (i + 1) * 20);
-            await Task.Delay(600).ConfigureAwait(false);
-        }
-
-        window.ReportComplete(true, null);
-        await Task.Delay(3000).ConfigureAwait(false);
-        await Dispatcher.UIThread.InvokeAsync(() => desktop.Shutdown(0));
-    }
-
     private static async Task SimulateOobePreviewAsync(IClassicDesktopStyleApplicationLifetime desktop, OobeWindow window)
     {
         try
diff --git a/LanMountainDesktop.Launcher/ViewModels/DevDebugWindowViewModel.cs b/LanMountainDesktop.Launcher/ViewModels/DevDebugWindowViewModel.cs
index b149e5a..22d4259 100644
--- a/LanMountainDesktop.Launcher/ViewModels/DevDebugWindowViewModel.cs
+++ b/LanMountainDesktop.Launcher/ViewModels/DevDebugWindowViewModel.cs
@@ -11,7 +11,6 @@ public sealed class DevDebugWindowViewModel : INotifyPropertyChanged
 {
     private bool _isSplashEnabled = true;
     private bool _isErrorEnabled = true;
-    private bool _isUpdateEnabled = true;
     private bool _isOobeEnabled = true;
     private bool _isDataLocationEnabled = true;
     private string _statusMessage = "就绪";
@@ -54,23 +53,6 @@ public sealed class DevDebugWindowViewModel : INotifyPropertyChanged
         }
     }
 
-    /// <summary>
-    /// 更新页面是否启用实际功能
-    /// </summary>
-    public bool IsUpdateEnabled
-    {
-        get => _isUpdateEnabled;
-        set
-        {
-            if (_isUpdateEnabled != value)
-            {
-                _isUpdateEnabled = value;
-                OnPropertyChanged();
-                UpdateStatus($"更新页面: {(value ? "功能模式" : "仅查看")}");
-            }
-        }
-    }
-
     /// <summary>
     /// OOBE页面是否启用实际功能
     /// </summary>
@@ -139,11 +121,6 @@ public sealed class DevDebugWindowViewModel : INotifyPropertyChanged
     /// </summary>
     public ICommand OpenErrorCommand { get; }
 
-    /// <summary>
-    /// 打开更新页面命令
-    /// </summary>
-    public ICommand OpenUpdateCommand { get; }
-
     /// <summary>
     /// 打开OOBE页面命令
     /// </summary>
@@ -183,11 +160,6 @@ public sealed class DevDebugWindowViewModel : INotifyPropertyChanged
     /// </summary>
     public event EventHandler<ErrorOpenEventArgs>? OpenErrorRequested;
 
-    /// <summary>
-    /// 请求打开更新页面
-    /// </summary>
-    public event EventHandler<UpdateOpenEventArgs>? OpenUpdateRequested;
-
     /// <summary>
     /// 请求打开OOBE页面
     /// </summary>
@@ -217,11 +189,6 @@ public sealed class DevDebugWindowViewModel : INotifyPropertyChanged
             OpenErrorRequested?.Invoke(this, new ErrorOpenEventArgs(IsErrorEnabled));
         });
 
-        OpenUpdateCommand = new RelayCommand(() =>
-        {
-            OpenUpdateRequested?.Invoke(this, new UpdateOpenEventArgs(IsUpdateEnabled));
-        });
-
         OpenOobeCommand = new RelayCommand(() =>
         {
             OpenOobeRequested?.Invoke(this, new OobeOpenEventArgs(IsOobeEnabled));
@@ -236,7 +203,6 @@ public sealed class DevDebugWindowViewModel : INotifyPropertyChanged
         {
             IsSplashEnabled = false;
             IsErrorEnabled = false;
-            IsUpdateEnabled = false;
             IsOobeEnabled = false;
             IsDataLocationEnabled = false;
             UpdateStatus("全部页面已切换到查看模式");
@@ -246,7 +212,6 @@ public sealed class DevDebugWindowViewModel : INotifyPropertyChanged
         {
             IsSplashEnabled = true;
             IsErrorEnabled = true;
-            IsUpdateEnabled = true;
             IsOobeEnabled = true;
             IsDataLocationEnabled = true;
             UpdateStatus("全部页面已切换到功能模式");
@@ -283,12 +248,6 @@ public class ErrorOpenEventArgs : EventArgs
     public ErrorOpenEventArgs(bool isFunctional) => IsFunctional = isFunctional;
 }
 
-public class UpdateOpenEventArgs : EventArgs
-{
-    public bool IsFunctional { get; }
-    public UpdateOpenEventArgs(bool isFunctional) => IsFunctional = isFunctional;
-}
-
 public class OobeOpenEventArgs : EventArgs
 {
     public bool IsFunctional { get; }
diff --git a/LanMountainDesktop.Launcher/Views/DevDebugWindow.axaml b/LanMountainDesktop.Launcher/Views/DevDebugWindow.axaml
index 6b083d2..6e2eef9 100644
--- a/LanMountainDesktop.Launcher/Views/DevDebugWindow.axaml
+++ b/LanMountainDesktop.Launcher/Views/DevDebugWindow.axaml
@@ -91,32 +91,6 @@
             </Grid>
           </Border>
 
-          <!-- 更新页面 -->
-          <Border Background="{DynamicResource SystemControlBackgroundAltMediumBrush}"
-                  CornerRadius="8"
-                  Padding="15">
-            <Grid ColumnDefinitions="*,Auto">
-              <StackPanel Grid.Column="0">
-                <TextBlock Text="{x:Static res:Strings.DevDebug_Update}"
-                           FontWeight="SemiBold"
-                           FontSize="14" />
-                <TextBlock Text="显示更新进度和状态"
-                           FontSize="11"
-                           Opacity="0.6"
-                           Margin="0,3,0,0" />
-              </StackPanel>
-              <StackPanel Grid.Column="1" Spacing="8">
-                <ToggleSwitch Content="{x:Static res:Strings.DevDebug_EnableFeature}"
-                              IsChecked="{Binding IsUpdateEnabled}"
-                              OnContent="功能"
-                              OffContent="查看" />
-                <Button Content="{x:Static res:Strings.DevDebug_Open}"
-                        Command="{Binding OpenUpdateCommand}"
-                        HorizontalAlignment="Right" />
-              </StackPanel>
-            </Grid>
-          </Border>
-
           <!-- OOBE页面 -->
           <Border Background="{DynamicResource SystemControlBackgroundAltMediumBrush}"
                   CornerRadius="8"
diff --git a/LanMountainDesktop.Launcher/Views/DevDebugWindow.axaml.cs b/LanMountainDesktop.Launcher/Views/DevDebugWindow.axaml.cs
index 95db7cd..44c2c1a 100644
--- a/LanMountainDesktop.Launcher/Views/DevDebugWindow.axaml.cs
+++ b/LanMountainDesktop.Launcher/Views/DevDebugWindow.axaml.cs
@@ -24,7 +24,6 @@ public partial class DevDebugWindow : Window
         // 订阅事件
         _viewModel.OpenSplashRequested += OnOpenSplashRequested;
         _viewModel.OpenErrorRequested += OnOpenErrorRequested;
-        _viewModel.OpenUpdateRequested += OnOpenUpdateRequested;
         _viewModel.OpenOobeRequested += OnOpenOobeRequested;
         _viewModel.OpenDataLocationRequested += OnOpenDataLocationRequested;
         _viewModel.CloseRequested += OnCloseRequested;
@@ -74,28 +73,6 @@ public partial class DevDebugWindow : Window
         errorWindow.Show();
     }
 
-    /// <summary>
-    /// 打开更新页面
-    /// </summary>
-    private void OnOpenUpdateRequested(object? sender, UpdateOpenEventArgs e)
-    {
-        var updateWindow = new UpdateWindow();
-        
-        if (!e.IsFunctional)
-        {
-            // 查看模式：显示模拟更新
-            updateWindow.SetDebugMode(true);
-        }
-        
-        updateWindow.Show();
-        
-        if (e.IsFunctional)
-        {
-            // 功能模式：模拟更新进度
-            _ = SimulateUpdateProgress(updateWindow);
-        }
-    }
-
     /// <summary>
     /// 打开OOBE页面
     /// </summary>
@@ -161,7 +138,7 @@ public partial class DevDebugWindow : Window
     /// </summary>
     private async Task SimulateSplashProgress(SplashWindow splashWindow)
     {
-        var stages = new[] { Strings.Preview_SplashInitializing, Strings.Preview_SplashCheckingUpdates, Strings.Preview_SplashCheckingPlugins, Strings.Preview_SplashLaunchingHost };
+        var stages = new[] { Strings.Preview_SplashInitializing, Strings.Preview_SplashCheckingPlugins, Strings.Preview_SplashLaunchingHost };
         var reporter = (ISplashStageReporter)splashWindow;
         
         for (int i = 0; i < stages.Length; i++)
@@ -175,33 +152,13 @@ public partial class DevDebugWindow : Window
         splashWindow.Close();
     }
 
-    /// <summary>
-    /// 模拟更新进度
-    /// </summary>
-    private async Task SimulateUpdateProgress(UpdateWindow updateWindow)
-    {
-        var stages = new[] { "下载", "验证", "安装", "清理" };
-        
-        foreach (var stage in stages)
-        {
-            updateWindow.Report(stage, $"正在{stage}...", Array.IndexOf(stages, stage) * 25 + 10);
-            await Task.Delay(800);
-        }
-        
-        updateWindow.ReportComplete(true, null);
-        
-        // 2秒后关闭
-        await Task.Delay(2000);
-        updateWindow.Close();
-    }
-
     protected override void OnClosed(EventArgs e)
     {
         // 取消订阅事件
         _viewModel.OpenSplashRequested -= OnOpenSplashRequested;
         _viewModel.OpenErrorRequested -= OnOpenErrorRequested;
-        _viewModel.OpenUpdateRequested -= OnOpenUpdateRequested;
         _viewModel.OpenOobeRequested -= OnOpenOobeRequested;
+        _viewModel.OpenDataLocationRequested -= OnOpenDataLocationRequested;
         _viewModel.CloseRequested -= OnCloseRequested;
         
         base.OnClosed(e);
diff --git a/LanMountainDesktop.Launcher/Views/UpdateWindow.axaml b/LanMountainDesktop.Launcher/Views/UpdateWindow.axaml
deleted file mode 100644
index 5369989..0000000
--- a/LanMountainDesktop.Launcher/Views/UpdateWindow.axaml
+++ /dev/null
@@ -1,110 +0,0 @@
-<Window xmlns="https://github.com/avaloniaui"
-        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
-        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-        xmlns:views="clr-namespace:LanMountainDesktop.Launcher.Views"
-        xmlns:res="clr-namespace:LanMountainDesktop.Launcher.Resources"
-        mc:Ignorable="d"
-        d:DesignWidth="480"
-        d:DesignHeight="320"
-        x:Class="LanMountainDesktop.Launcher.Views.UpdateWindow"
-        x:DataType="views:UpdateWindow"
-        x:CompileBindings="False"
-        Title="{x:Static res:Strings.Update_Title}"
-        Width="480"
-        Height="320"
-        CanResize="False"
-        WindowStartupLocation="CenterScreen"
-        WindowDecorations="None"
-        Background="{DynamicResource SolidBackgroundFillColorBaseBrush}"
-        TransparencyLevelHint="None"
-        Icon="/Assets/logo.ico">
-  <Design.DataContext>
-    <views:UpdateWindow />
-  </Design.DataContext>
-
-  <Grid>
-    <!-- 顶部：应用名称和最小化按钮 -->
-    <Grid VerticalAlignment="Top" Margin="24,24,24,0">
-      <StackPanel Orientation="Horizontal" HorizontalAlignment="Left" VerticalAlignment="Center" Spacing="8">
-        <TextBlock x:Name="TitleText"
-                   Text="{x:Static res:Strings.Update_AppName}"
-                   FontSize="24"
-                   FontWeight="SemiBold"
-                   Foreground="{DynamicResource TextFillColorPrimaryBrush}" />
-        <Border Background="{DynamicResource AccentFillColorDefaultBrush}"
-                CornerRadius="4"
-                Padding="6,2"
-                VerticalAlignment="Center">
-          <TextBlock Text="{x:Static res:Strings.Update_StatusUpdate}"
-                     FontSize="11"
-                     FontWeight="SemiBold"
-                     Foreground="{DynamicResource TextOnAccentFillColorPrimaryBrush}" />
-        </Border>
-      </StackPanel>
-
-      <!-- 最小化按钮 -->
-      <Button x:Name="MinimizeButton"
-              HorizontalAlignment="Right"
-              VerticalAlignment="Center"
-              Width="32"
-              Height="32"
-              Background="Transparent"
-              BorderThickness="0">
-        <TextBlock Text="&#xE921;"
-                   FontSize="12"
-                   FontFamily="{DynamicResource SymbolThemeFontFamily}"
-                   Foreground="{DynamicResource TextFillColorSecondaryBrush}"
-                   HorizontalAlignment="Center"
-                   VerticalAlignment="Center"/>
-      </Button>
-    </Grid>
-
-    <!-- 底部区域：进度条和状态 -->
-    <Grid VerticalAlignment="Bottom" Margin="24,0,24,24">
-      <Grid.RowDefinitions>
-        <RowDefinition Height="Auto"/>
-        <RowDefinition Height="Auto"/>
-      </Grid.RowDefinitions>
-      
-      <!-- 第一行：左下角状态，右下角百分比 -->
-      <Grid Grid.Row="0" Margin="0,0,0,8">
-        <Grid.ColumnDefinitions>
-          <ColumnDefinition Width="*"/>
-          <ColumnDefinition Width="Auto"/>
-        </Grid.ColumnDefinitions>
-        
-        <!-- 左下角：状态文字 -->
-        <TextBlock x:Name="StatusText"
-                   Grid.Column="0"
-                   FontSize="11"
-                   Foreground="{DynamicResource TextFillColorSecondaryBrush}"
-                   Opacity="0.8"
-                   HorizontalAlignment="Left"
-                   VerticalAlignment="Bottom"
-                   Text="{x:Static res:Strings.Update_StatusUpdating}" />
-        
-        <!-- 右下角：百分比 -->
-        <TextBlock x:Name="PercentText"
-                   Grid.Column="1"
-                   FontSize="11"
-                   Foreground="{DynamicResource TextFillColorSecondaryBrush}"
-                   Opacity="0.8"
-                   HorizontalAlignment="Right"
-                   VerticalAlignment="Bottom"
-                   Text="0%" />
-      </Grid>
-      
-      <!-- 底部：进度条 -->
-      <ProgressBar x:Name="ProgressIndicator"
-                   Grid.Row="1"
-                   Minimum="0"
-                   Maximum="100"
-                   Value="0"
-                   Height="4"
-                   IsIndeterminate="True"
-                   Foreground="{DynamicResource AccentFillColorDefaultBrush}"
-                   Background="{DynamicResource ControlStrokeColorDefaultBrush}" />
-    </Grid>
-  </Grid>
-</Window>
diff --git a/LanMountainDesktop.Launcher/Views/UpdateWindow.axaml.cs b/LanMountainDesktop.Launcher/Views/UpdateWindow.axaml.cs
deleted file mode 100644
index 28c4501..0000000
--- a/LanMountainDesktop.Launcher/Views/UpdateWindow.axaml.cs
+++ /dev/null
@@ -1,124 +0,0 @@
-using Avalonia.Controls;
-using Avalonia.Markup.Xaml;
-using Avalonia.Threading;
-using LanMountainDesktop.Launcher.Resources;
-
-namespace LanMountainDesktop.Launcher.Views;
-
-/// <summary>
-/// 更新进度窗口 - 用于预览模式显示更新/插件升级进度
-/// </summary>
-public partial class UpdateWindow : Window
-{
-    public UpdateWindow()
-    {
-        AvaloniaXamlLoader.Load(this);
-        InitializeEventHandlers();
-    }
-
-    /// <summary>
-    /// 初始化事件处理程序
-    /// </summary>
-    private void InitializeEventHandlers()
-    {
-        var minimizeButton = this.FindControl<Button>("MinimizeButton");
-        if (minimizeButton != null)
-        {
-            minimizeButton.Click += (s, e) =>
-            {
-                this.WindowState = WindowState.Minimized;
-            };
-        }
-    }
-
-    /// <summary>
-    /// 更新状态和进度
-    /// </summary>
-    public void Report(string stage, string message, int progressPercent = -1)
-    {
-        Dispatcher.UIThread.Post(() =>
-        {
-            var statusText = this.FindControl<TextBlock>("StatusText");
-            var progressIndicator = this.FindControl<ProgressBar>("ProgressIndicator");
-            var percentText = this.FindControl<TextBlock>("PercentText");
-
-            if (statusText is null || progressIndicator is null || percentText is null)
-            {
-                Console.Error.WriteLine($"[UpdateWindow] Controls not found in Report: StatusText={statusText != null}, ProgressIndicator={progressIndicator != null}, PercentText={percentText != null}");
-                return;
-            }
-
-            statusText.Text = message;
-
-            if (progressPercent >= 0)
-            {
-                progressIndicator.IsIndeterminate = false;
-                progressIndicator.Value = progressPercent;
-                percentText.Text = $"{progressPercent}%";
-            }
-            else
-            {
-                progressIndicator.IsIndeterminate = true;
-                percentText.Text = "";
-            }
-        });
-    }
-
-    /// <summary>
-    /// 显示更新完成状态
-    /// </summary>
-    public void ReportComplete(bool success, string? errorMessage = null)
-    {
-        Dispatcher.UIThread.Post(() =>
-        {
-            var statusText = this.FindControl<TextBlock>("StatusText");
-            var progressIndicator = this.FindControl<ProgressBar>("ProgressIndicator");
-            var percentText = this.FindControl<TextBlock>("PercentText");
-            var titleText = this.FindControl<TextBlock>("TitleText");
-
-            if (statusText is null || progressIndicator is null || percentText is null || titleText is null)
-            {
-                Console.Error.WriteLine($"[UpdateWindow] Controls not found in ReportComplete");
-                return;
-            }
-
-            progressIndicator.IsIndeterminate = false;
-            progressIndicator.Value = 100;
-            percentText.Text = "100%";
-
-            if (success)
-            {
-                statusText.Text = Strings.Update_Complete;
-            }
-            else
-            {
-                titleText.Text = Strings.Update_Failed;
-                statusText.Text = errorMessage ?? Strings.Update_FailedMessage;
-            }
-        });
-    }
-
-    /// <summary>
-    /// 设置调试模式
-    /// </summary>
-    public void SetDebugMode(bool isDebugMode)
-    {
-        Dispatcher.UIThread.Post(() =>
-        {
-            var statusText = this.FindControl<TextBlock>("StatusText");
-            var titleText = this.FindControl<TextBlock>("TitleText");
-
-            if (statusText is null || titleText is null)
-            {
-                Console.Error.WriteLine($"[UpdateWindow] Controls not found in SetDebugMode");
-                return;
-            }
-
-            if (isDebugMode)
-            {
-                titleText.Text = Strings.Update_DebugTitle;
-                statusText.Text = Strings.Update_DebugMessage;
-            }
-        });
-    }
-}
diff --git a/LanMountainDesktop.Shared.Contracts/Update/UpdateMessages.cs b/LanMountainDesktop.Shared.Contracts/Update/UpdateMessages.cs
index b486ee0..6533187 100644
--- a/LanMountainDesktop.Shared.Contracts/Update/UpdateMessages.cs
+++ b/LanMountainDesktop.Shared.Contracts/Update/UpdateMessages.cs
@@ -54,13 +54,3 @@ public sealed record UpdateCheckReport(
     long? TotalDownloadBytes,
     long? FullInstallerBytes,
     string? ErrorMessage);
-
-public sealed record InstallRequest(
-    UpdatePayloadKind PayloadKind,
-    string LauncherRoot,
-    string? LaunchSource = null);
-
-public sealed record LaunchResult(
-    bool Success,
-    string? ErrorMessage,
-    int? ProcessId);
diff --git a/LanMountainDesktop.Tests/PlondsClientServiceTests.cs b/LanMountainDesktop.Tests/PlondsClientServiceTests.cs
index 166ecb9..b106c98 100644
--- a/LanMountainDesktop.Tests/PlondsClientServiceTests.cs
+++ b/LanMountainDesktop.Tests/PlondsClientServiceTests.cs
@@ -88,7 +88,7 @@ public sealed class PlondsClientServiceTests : IDisposable
         Assert.False(result.Success);
         Assert.True(result.RequiresUiHandling);
         Assert.Null(result.Package);
-        Assert.Contains("full package fallback also failed", result.ErrorMessage);
+        Assert.Contains("全量回退也失败", result.ErrorMessage);
     }
 
     [Fact]
@@ -103,11 +103,11 @@ public sealed class PlondsClientServiceTests : IDisposable
                 CreateManifest("1.2.3", requiresCleanInstall: true)),
             CancellationToken.None);
 
-        Assert.False(result.Success);
-        Assert.True(result.RequiresUiHandling);
-        Assert.Contains("clean install", result.ErrorMessage);
+        // Clean install now uses full package from the same PLONDS/S3 source (not GitHub EXE).
+        Assert.True(result.Success);
         Assert.Equal(0, downloader.DeltaCalls);
-        Assert.Equal(0, downloader.FullCalls);
+        Assert.Equal(1, downloader.FullCalls);
+        Assert.Equal(PlondsPackageMode.Full, result.Package?.Mode);
     }
 
     [Fact]
@@ -365,7 +365,7 @@ public sealed class PlondsClientServiceTests : IDisposable
 
         Assert.False(result.Success);
         Assert.True(result.RequiresUiHandling);
-        Assert.Contains("full package fallback also failed", result.ErrorMessage);
+        Assert.Contains("全量回退也失败", result.ErrorMessage);
     }
 
     [Fact]
diff --git a/LanMountainDesktop.Tests/UpdateSettingsInterfaceTests.cs b/LanMountainDesktop.Tests/UpdateSettingsInterfaceTests.cs
index efba420..a41e48e 100644
--- a/LanMountainDesktop.Tests/UpdateSettingsInterfaceTests.cs
+++ b/LanMountainDesktop.Tests/UpdateSettingsInterfaceTests.cs
@@ -1,4 +1,4 @@
-using CommunityToolkit.Mvvm.Input;
+using CommunityToolkit.Mvvm.Input;
 using LanMountainDesktop.Models;
 using LanMountainDesktop.PluginSdk;
 using LanMountainDesktop.Services;
@@ -100,20 +100,31 @@ public sealed class UpdateSettingsInterfaceTests
         var update = new FakeUpdateSettingsService();
         var viewModel = new UpdateSettingsViewModel(new FakeSettingsFacade(update));
 
-        viewModel.SelectedUpdateChannelValue = UpdateSettingsValues.ChannelPreview;
-        viewModel.SelectedUpdateSourceValue = UpdateSettingsValues.DownloadSourceGitHub;
-        viewModel.SelectedUpdateModeValue = UpdateSettingsValues.ModeManual;
+        viewModel.SmartUpdateEnabled = true;
+        viewModel.SelectedUpdateModeValue = UpdateSettingsValues.ModeSilentInstall;
         viewModel.DownloadThreadsSliderValue = 12;
         viewModel.ForceReinstall = true;
 
-        Assert.True(update.SaveCalls >= 5);
-        Assert.Equal(UpdateSettingsValues.ChannelPreview, update.State.UpdateChannel);
-        Assert.Equal(UpdateSettingsValues.DownloadSourceGitHub, update.State.UpdateDownloadSource);
-        Assert.Equal(UpdateSettingsValues.ModeManual, update.State.UpdateMode);
+        Assert.True(update.SaveCalls >= 3);
+        Assert.Equal(UpdateSettingsValues.ChannelStable, update.State.UpdateChannel);
+        Assert.Equal(UpdateSettingsValues.DownloadSourcePlonds, update.State.UpdateDownloadSource);
+        Assert.Equal(UpdateSettingsValues.ModeSilentInstall, update.State.UpdateMode);
         Assert.Equal(12, update.State.UpdateDownloadThreads);
         Assert.True(update.State.ForceUpdateReinstall);
     }
 
+    [Fact]
+    public void UpdateSettingsViewModel_DisablingSmartUpdate_ForcesManualMode()
+    {
+        var update = new FakeUpdateSettingsService();
+        var viewModel = new UpdateSettingsViewModel(new FakeSettingsFacade(update));
+
+        viewModel.SmartUpdateEnabled = false;
+
+        Assert.Equal(UpdateSettingsValues.ModeManual, update.State.UpdateMode);
+        Assert.Equal(UpdateSettingsValues.DownloadSourcePlonds, update.State.UpdateDownloadSource);
+    }
+
     [Fact]
     public void UpdateSettingsViewModel_RestoresPersistedPendingAndLastCheckedState()
     {
@@ -236,7 +247,7 @@ public sealed class UpdateSettingsInterfaceTests
     }
 
     [Fact]
-    public async Task UpdateSettingsService_WhenGitHubSelected_UsesOrchestrator()
+    public async Task UpdateSettingsService_WhenGitHubSelectedInSnapshot_StillUsesPlondsSmartUpdate()
     {
         var settings = new FakeSettingsService
         {
@@ -245,28 +256,33 @@ public sealed class UpdateSettingsInterfaceTests
                 UpdateDownloadSource = UpdateSettingsValues.DownloadSourceGitHub
             }
         };
-        var orchestrator = CreateTestOrchestrator(DefaultUpdateState() with
+        var plonds = new FakePlondsService
         {
-            UpdateDownloadSource = UpdateSettingsValues.DownloadSourceGitHub
-        });
+            LatestResult = PlondsLatestResult.Available(
+                new Version(1, 0, 0),
+                new Version(2, 0, 0),
+                [new PlondsManifestCandidate(
+                    new PlondsSourceDescriptor("s3", "s3", "https://s3.test/PLONDS.json", 100),
+                    CreatePlondsManifest("2.0.0"))])
+        };
         var orchestratorCreated = false;
         var service = new UpdateSettingsService(
             settings,
             orchestratorFactory: () =>
             {
                 orchestratorCreated = true;
-                return orchestrator;
+                throw new InvalidOperationException("UpdateOrchestrator should not be used for smart update.");
             },
-            plondsService: new FakePlondsService());
+            plondsService: plonds);
 
-        var _ = service.CurrentPhase;
-
-        Assert.False(orchestratorCreated);
+        var state = service.Get();
+        Assert.Equal(UpdateSettingsValues.DownloadSourcePlonds, state.UpdateDownloadSource);
 
         var report = await service.CheckAsync(CancellationToken.None);
 
-        Assert.True(orchestratorCreated);
+        Assert.False(orchestratorCreated);
         Assert.True(report.IsUpdateAvailable);
+        Assert.Equal(1, plonds.FindLatestCalls);
     }
 
     [Fact]
@@ -450,6 +466,7 @@ public sealed class UpdateSettingsInterfaceTests
         public PlondsPrepareResult PrepareResult { get; set; } = PlondsPrepareResult.FailedForUi("not prepared");
         public int FindLatestCalls { get; private set; }
         public int PrepareLatestCalls { get; private set; }
+        public bool? LastForceFullPackage { get; private set; }
 
         public Task<PlondsLatestResult> FindLatestAsync(Version currentVersion, CancellationToken cancellationToken)
         {
@@ -468,6 +485,16 @@ public sealed class UpdateSettingsInterfaceTests
             PrepareLatestCalls++;
             return Task.FromResult(PrepareResult);
         }
+
+        public Task<PlondsPrepareResult> FindAndPrepareLatestAsync(
+            Version currentVersion,
+            bool forceFullPackage,
+            CancellationToken cancellationToken)
+        {
+            PrepareLatestCalls++;
+            LastForceFullPackage = forceFullPackage;
+            return Task.FromResult(PrepareResult);
+        }
     }
 
     private sealed class FakeSettingsService : ISettingsService
@@ -629,3 +656,4 @@ public sealed class UpdateSettingsInterfaceTests
         public AppRenderBackendInfo GetRenderBackendInfo() => throw new NotSupportedException();
     }
 }
+
diff --git a/LanMountainDesktop/App.axaml b/LanMountainDesktop/App.axaml
index 21e9f47..fd6c848 100644
--- a/LanMountainDesktop/App.axaml
+++ b/LanMountainDesktop/App.axaml
@@ -1,6 +1,7 @@
-<Application xmlns="https://github.com/avaloniaui"
+    <Application xmlns="https://github.com/avaloniaui"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:sty="using:FluentAvalonia.Styling"
+             xmlns:ui="using:FluentAvalonia.UI.Controls"
              xmlns:fi="using:FluentIcons.Avalonia"
              xmlns:mi="clr-namespace:Material.Icons.Avalonia;assembly=Material.Icons.Avalonia"
              xmlns:conv="using:LanMountainDesktop.Converters"
@@ -67,6 +68,7 @@
             <Setter Property="HorizontalAlignment" Value="Center" />
         </Style>
 
+        <!-- Fluent icon scale used by settings cards and chrome -->
         <Style Selector="fi|SymbolIcon.icon-s, fi|FluentIcon.icon-s">
             <Setter Property="FontSize" Value="12" />
         </Style>
@@ -79,6 +81,12 @@
             <Setter Property="FontSize" Value="20" />
         </Style>
 
+        <!-- Default FAFontIcon in settings surfaces to list-icon size unless overridden -->
+        <Style Selector="ui|FAFontIcon">
+            <Setter Property="FontSize" Value="16" />
+            <Setter Property="VerticalAlignment" Value="Center" />
+        </Style>
+
         <Style Selector="mi|MaterialIcon">
             <Setter Property="Foreground" Value="{DynamicResource AdaptiveTextPrimaryBrush}" />
             <Setter Property="Width" Value="20" />
diff --git a/LanMountainDesktop/Controls/SettingsOptionCard.axaml b/LanMountainDesktop/Controls/SettingsOptionCard.axaml
index ce5b6f3..40855f4 100644
--- a/LanMountainDesktop/Controls/SettingsOptionCard.axaml
+++ b/LanMountainDesktop/Controls/SettingsOptionCard.axaml
@@ -29,9 +29,10 @@
                                   VerticalAlignment="Center" />
             </Grid>
 
+            <!-- 28 icon host + 14 column spacing => content indent ~42 -->
             <ContentPresenter x:Name="DetailsContentHost"
                               Grid.Row="1"
-                              Margin="54,0,0,0" />
+                              Margin="42,0,0,0" />
         </Grid>
     </Border>
 </UserControl>
diff --git a/LanMountainDesktop/Controls/SettingsSectionCard.axaml b/LanMountainDesktop/Controls/SettingsSectionCard.axaml
index 7a564d4..772f1e9 100644
--- a/LanMountainDesktop/Controls/SettingsSectionCard.axaml
+++ b/LanMountainDesktop/Controls/SettingsSectionCard.axaml
@@ -12,7 +12,7 @@
                 <Border x:Name="IconHost"
                         Classes="settings-section-card-icon-host">
                     <fi:SymbolIcon x:Name="CardIcon"
-                                   Classes="icon-l" />
+                                   Classes="icon-m" />
                 </Border>
 
                 <StackPanel Grid.Column="1"
diff --git a/LanMountainDesktop/Localization/zh-CN.json b/LanMountainDesktop/Localization/zh-CN.json
index 4b9ebdb..ebca20b 100644
--- a/LanMountainDesktop/Localization/zh-CN.json
+++ b/LanMountainDesktop/Localization/zh-CN.json
@@ -894,9 +894,13 @@
     "settings.update.status_redownload_no_check":  "请先检查更新后再重新下载。",
     "settings.update.status_redownloading":  "正在重新下载安装包...",
     "settings.update.status_redownload_failed_format":  "重新下载失败：{0}",
-    "settings.update.source_plonds":  "PLONDS",
-    "settings.update.source_plonds_desc":  "优先使用 PLONDS 分发端点，不可用时自动回退到 GitHub。",
-    "settings.update.status_check_failed_plonds":  "PLONDS 更新检查失败，正在回退到 GitHub...",
+    "settings.update.source_plonds":  "智慧更新",
+    "settings.update.source_plonds_desc":  "通过官方 S3/CDN（PLONDS）自动获取增量或全量更新。",
+    "settings.update.status_check_failed_plonds":  "智慧更新检查失败，请检查网络或稍后重试。",
+    "settings.update.smart_update_label":  "智慧更新",
+    "settings.update.smart_update_description":  "开启后自动检查更新：优先官方 S3/CDN，失败时回退 GitHub（含全量重装），无需手动选择渠道。",
+    "settings.update.smart_update_on":  "开",
+    "settings.update.smart_update_off":  "关",
     "settings.window.drawer_default":  "详情",
     "settings.search.placeholder":  "搜索设置",
     "settings.search.no_results":  "没有匹配的设置",
diff --git a/LanMountainDesktop/Services/Plonds/IPlondsService.cs b/LanMountainDesktop/Services/Plonds/IPlondsService.cs
index 3ff28b7..e9d5609 100644
--- a/LanMountainDesktop/Services/Plonds/IPlondsService.cs
+++ b/LanMountainDesktop/Services/Plonds/IPlondsService.cs
@@ -7,4 +7,9 @@ internal interface IPlondsService
     Task<PlondsPrepareResult> FindAndPrepareLatestAsync(CancellationToken cancellationToken);
 
     Task<PlondsPrepareResult> FindAndPrepareLatestAsync(Version currentVersion, CancellationToken cancellationToken);
+
+    Task<PlondsPrepareResult> FindAndPrepareLatestAsync(
+        Version currentVersion,
+        bool forceFullPackage,
+        CancellationToken cancellationToken);
 }
diff --git a/LanMountainDesktop/Services/Plonds/PlondsClientServiceFactory.cs b/LanMountainDesktop/Services/Plonds/PlondsClientServiceFactory.cs
index b2fe4cf..fdee554 100644
--- a/LanMountainDesktop/Services/Plonds/PlondsClientServiceFactory.cs
+++ b/LanMountainDesktop/Services/Plonds/PlondsClientServiceFactory.cs
@@ -9,7 +9,7 @@ internal static class PlondsClientServiceFactory
 
     public static IPlondsService CreateDefault(HttpClient? httpClient = null)
     {
-        var client = httpClient ?? new HttpClient { Timeout = TimeSpan.FromSeconds(30) };
+        var client = httpClient ?? PlondsHttpClientFactory.Create();
         var dataRoot = Path.Combine(AppDataPathProvider.GetDataRoot(), "PLONDS");
         var sourceStore = new PlondsSourceStore(Path.Combine(dataRoot, "sources.json"));
         var registry = new PlondsSourceRegistry(CreateBuiltInSources());
@@ -26,19 +26,34 @@ internal static class PlondsClientServiceFactory
             sourceStore);
     }
 
+    /// <summary>
+    /// Built-in sources. S3/CDN is the primary 智慧更新 endpoint; GitHub is fallback only.
+    /// </summary>
     internal static IReadOnlyList<PlondsSourceDescriptor> CreateBuiltInSources()
     {
+        var baseUrl = ResolveManifestUrl(
+            UpdateSettingsValues.PlondsStaticBaseUrlEnvironmentVariable,
+            UpdateSettingsValues.DefaultPlondsStaticBaseUrl).TrimEnd('/');
+
+        var s3Manifest = ResolveManifestUrl(
+            S3ManifestUrlEnvironmentVariable,
+            $"{baseUrl}/plonds/PLONDS.json");
+
+        var githubManifest = ResolveManifestUrl(
+            GitHubManifestUrlEnvironmentVariable,
+            DefaultGitHubManifestUrl);
+
         return
         [
             new(
                 Id: "s3",
                 Kind: "s3",
-                ManifestUrl: ResolveManifestUrl(S3ManifestUrlEnvironmentVariable, DefaultS3ManifestUrl),
+                ManifestUrl: s3Manifest,
                 Priority: 100),
             new(
                 Id: "github",
                 Kind: "github",
-                ManifestUrl: ResolveManifestUrl(GitHubManifestUrlEnvironmentVariable, DefaultGitHubManifestUrl),
+                ManifestUrl: githubManifest,
                 Priority: 50)
         ];
     }
diff --git a/LanMountainDesktop/Services/Plonds/PlondsDownloadPlanner.cs b/LanMountainDesktop/Services/Plonds/PlondsDownloadPlanner.cs
index dfc8fb4..fb9cc98 100644
--- a/LanMountainDesktop/Services/Plonds/PlondsDownloadPlanner.cs
+++ b/LanMountainDesktop/Services/Plonds/PlondsDownloadPlanner.cs
@@ -4,14 +4,33 @@ internal sealed class PlondsDownloadPlanner(IPlondsPackageDownloader downloader)
 {
     public async Task<PlondsPrepareResult> PrepareAsync(
         PlondsManifestCandidate candidate,
-        CancellationToken cancellationToken)
+        CancellationToken cancellationToken,
+        bool forceFullPackage = false)
     {
         ArgumentNullException.ThrowIfNull(candidate);
 
-        if (candidate.Manifest.RequiresCleanInstall)
+        // Clean install / force reinstall: prefer full PLONDS package from this source (S3 first, GitHub PLONDS second).
+        // If all PLONDS package sources fail, UpdateSettingsService may still fall back to a GitHub installer EXE.
+        if (forceFullPackage ||
+            candidate.Manifest.RequiresCleanInstall ||
+            candidate.Manifest.IsFullUpdate)
         {
-            return PlondsPrepareResult.FailedForUi(
-                "PLONDS manifest requires a clean install. Use the Host Update installer flow instead.");
+            try
+            {
+                var fullPackage = await downloader
+                    .PrepareFullAsync(candidate.Manifest, candidate.Source, cancellationToken)
+                    .ConfigureAwait(false);
+                return PlondsPrepareResult.Prepared(fullPackage);
+            }
+            catch (OperationCanceledException)
+            {
+                throw;
+            }
+            catch (Exception fullError)
+            {
+                return PlondsPrepareResult.FailedForUi(
+                    $"智慧更新全量包准备失败（将尝试其他源/GitHub 回退）：{fullError.Message}");
+            }
         }
 
         try
@@ -43,7 +62,7 @@ internal sealed class PlondsDownloadPlanner(IPlondsPackageDownloader downloader)
             catch (Exception fullError)
             {
                 return PlondsPrepareResult.FailedForUi(
-                    $"PLONDS delta package failed and full package fallback also failed. Delta: {deltaError.Message}; Full: {fullError.Message}");
+                    $"智慧更新增量包失败且全量回退也失败。增量：{deltaError.Message}；全量：{fullError.Message}");
             }
         }
     }
diff --git a/LanMountainDesktop/Services/Plonds/PlondsDownloadUrlResolver.cs b/LanMountainDesktop/Services/Plonds/PlondsDownloadUrlResolver.cs
index 8cc8160..984abc8 100644
--- a/LanMountainDesktop/Services/Plonds/PlondsDownloadUrlResolver.cs
+++ b/LanMountainDesktop/Services/Plonds/PlondsDownloadUrlResolver.cs
@@ -10,22 +10,32 @@ internal static class PlondsDownloadUrlResolver
         var urls = new List<string?>();
         var sourceKind = source.Kind.Trim().ToLowerInvariant();
 
+        // Prefer the selected source first so S3 stays primary for 智慧更新.
         if (sourceKind is "s3")
         {
             AddS3(urls, manifest, mode);
+            urls.Add(DerivePackageUrl(source.ManifestUrl, mode));
+            urls.Add(DeriveFromStaticBase(mode));
+            AddGitHub(urls, manifest, mode);
         }
         else if (sourceKind is "github")
         {
             AddGitHub(urls, manifest, mode);
+            urls.Add(DerivePackageUrl(source.ManifestUrl, mode));
+            AddS3(urls, manifest, mode);
+            urls.Add(DeriveFromStaticBase(mode));
+        }
+        else
+        {
+            urls.Add(DerivePackageUrl(source.ManifestUrl, mode));
+            AddS3(urls, manifest, mode);
+            AddGitHub(urls, manifest, mode);
+            urls.Add(DeriveFromStaticBase(mode));
         }
-
-        urls.Add(DerivePackageUrl(source.ManifestUrl, mode));
-        AddS3(urls, manifest, mode);
-        AddGitHub(urls, manifest, mode);
 
         return urls
             .Where(url => !string.IsNullOrWhiteSpace(url))
-            .Select(url => Uri.TryCreate(url, UriKind.Absolute, out var uri) ? uri : null)
+            .Select(url => Uri.TryCreate(url!.Trim(), UriKind.Absolute, out var uri) ? uri : null)
             .OfType<Uri>()
             .Where(uri => uri.Scheme is "http" or "https")
             .DistinctBy(uri => uri.AbsoluteUri, StringComparer.OrdinalIgnoreCase)
@@ -34,9 +44,16 @@ internal static class PlondsDownloadUrlResolver
 
     private static void AddS3(List<string?> urls, PlondsClientManifest manifest, PlondsPackageMode mode)
     {
-        urls.Add(mode is PlondsPackageMode.Delta
-            ? manifest.Downloads?.S3?.ChangedZipUrl
-            : manifest.Downloads?.S3?.FilesZipUrl);
+        if (mode is PlondsPackageMode.Delta)
+        {
+            urls.Add(manifest.Downloads?.S3?.ChangedZipUrl);
+            urls.Add(manifest.Downloads?.S3?.ChangedFolderUrl);
+        }
+        else
+        {
+            urls.Add(manifest.Downloads?.S3?.FilesZipUrl);
+            urls.Add(manifest.Downloads?.S3?.FilesFolderUrl);
+        }
     }
 
     private static void AddGitHub(List<string?> urls, PlondsClientManifest manifest, PlondsPackageMode mode)
@@ -54,14 +71,35 @@ internal static class PlondsDownloadUrlResolver
             return null;
         }
 
+        // Accept both "Files.zip" (tool convention) and "files.zip".
         var packageName = mode is PlondsPackageMode.Delta ? "changed.zip" : "Files.zip";
-        var builder = new UriBuilder(uri);
+        var builder = new UriBuilder(uri)
+        {
+            Query = string.Empty,
+            Fragment = string.Empty
+        };
         var lastSlash = builder.Path.LastIndexOf('/');
         builder.Path = lastSlash >= 0
             ? $"{builder.Path[..(lastSlash + 1)]}{packageName}"
             : packageName;
-        builder.Query = string.Empty;
-        builder.Fragment = string.Empty;
         return builder.Uri.AbsoluteUri;
     }
+
+    private static string? DeriveFromStaticBase(PlondsPackageMode mode)
+    {
+        var baseUrl = Environment.GetEnvironmentVariable(UpdateSettingsValues.PlondsStaticBaseUrlEnvironmentVariable);
+        if (string.IsNullOrWhiteSpace(baseUrl))
+        {
+            baseUrl = UpdateSettingsValues.DefaultPlondsStaticBaseUrl;
+        }
+
+        baseUrl = baseUrl.Trim().TrimEnd('/');
+        if (!Uri.TryCreate(baseUrl, UriKind.Absolute, out _))
+        {
+            return null;
+        }
+
+        var packageName = mode is PlondsPackageMode.Delta ? "changed.zip" : "Files.zip";
+        return $"{baseUrl}/plonds/{packageName}";
+    }
 }
diff --git a/LanMountainDesktop/Services/Plonds/PlondsHttpPackageDownloader.cs b/LanMountainDesktop/Services/Plonds/PlondsHttpPackageDownloader.cs
index 79aa3f9..bfa3d7a 100644
--- a/LanMountainDesktop/Services/Plonds/PlondsHttpPackageDownloader.cs
+++ b/LanMountainDesktop/Services/Plonds/PlondsHttpPackageDownloader.cs
@@ -39,13 +39,14 @@ internal sealed class PlondsHttpPackageDownloader(
         }
 
         Exception? lastError = null;
-        foreach (var url in urls)
+        foreach (var url in ExpandUrlCandidates(urls, mode))
         {
             cancellationToken.ThrowIfCancellationRequested();
 
             var staging = await packageStore.CreateStagingAsync(manifest, source, mode, cancellationToken).ConfigureAwait(false);
             try
             {
+                AppLogger.Info("PLONDS.Download", $"Downloading {mode} package from {url.AbsoluteUri}");
                 await DownloadToFileAsync(url, staging.PackageZipPath, cancellationToken).ConfigureAwait(false);
                 await verifier.VerifyFileAsync(
                     staging.PackageZipPath,
@@ -62,19 +63,44 @@ internal sealed class PlondsHttpPackageDownloader(
             }
             catch (Exception ex)
             {
+                AppLogger.Warn("PLONDS.Download", $"Package URL failed: {url.AbsoluteUri} -> {ex.Message}");
                 lastError = ex;
             }
         }
 
-        throw new InvalidOperationException($"Failed to prepare PLONDS {mode} package.", lastError);
+        throw new InvalidOperationException($"Failed to prepare PLONDS {mode} package from S3/CDN.", lastError);
+    }
+
+    private static IEnumerable<Uri> ExpandUrlCandidates(IReadOnlyList<Uri> urls, PlondsPackageMode mode)
+    {
+        foreach (var url in urls)
+        {
+            yield return url;
+            // Case variants commonly used by different publishers.
+            if (mode is PlondsPackageMode.Full &&
+                url.AbsoluteUri.EndsWith("Files.zip", StringComparison.OrdinalIgnoreCase))
+            {
+                var alt = url.AbsoluteUri.EndsWith("Files.zip", StringComparison.Ordinal)
+                    ? url.AbsoluteUri[..^"Files.zip".Length] + "files.zip"
+                    : url.AbsoluteUri[..^"files.zip".Length] + "Files.zip";
+                if (Uri.TryCreate(alt, UriKind.Absolute, out var altUri) &&
+                    !string.Equals(altUri.AbsoluteUri, url.AbsoluteUri, StringComparison.OrdinalIgnoreCase))
+                {
+                    yield return altUri;
+                }
+            }
+        }
     }
 
     private async Task DownloadToFileAsync(Uri url, string destinationPath, CancellationToken cancellationToken)
     {
-        using var response = await httpClient.GetAsync(url, HttpCompletionOption.ResponseHeadersRead, cancellationToken).ConfigureAwait(false);
+        using var request = new HttpRequestMessage(HttpMethod.Get, url);
+        request.Headers.TryAddWithoutValidation("Cache-Control", "no-cache");
+        using var response = await httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, cancellationToken).ConfigureAwait(false);
         if (!response.IsSuccessStatusCode)
         {
-            throw new HttpRequestException($"PLONDS package download failed: {(int)response.StatusCode} {response.ReasonPhrase}");
+            throw new HttpRequestException(
+                $"PLONDS package download failed: {(int)response.StatusCode} {response.ReasonPhrase} ({url.AbsoluteUri})");
         }
 
         var directory = Path.GetDirectoryName(Path.GetFullPath(destinationPath));
diff --git a/LanMountainDesktop/Services/Plonds/PlondsManifestClient.cs b/LanMountainDesktop/Services/Plonds/PlondsManifestClient.cs
index 70ab766..a84f6e1 100644
--- a/LanMountainDesktop/Services/Plonds/PlondsManifestClient.cs
+++ b/LanMountainDesktop/Services/Plonds/PlondsManifestClient.cs
@@ -7,14 +7,27 @@ internal sealed class PlondsManifestClient(HttpClient httpClient)
 {
     public async Task<PlondsClientManifest?> GetManifestAsync(PlondsSourceDescriptor source, CancellationToken cancellationToken)
     {
-        using var response = await httpClient.GetAsync(source.ManifestUrl, HttpCompletionOption.ResponseHeadersRead, cancellationToken).ConfigureAwait(false);
+        using var request = new HttpRequestMessage(HttpMethod.Get, source.ManifestUrl);
+        request.Headers.TryAddWithoutValidation("Cache-Control", "no-cache");
+
+        using var response = await httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, cancellationToken).ConfigureAwait(false);
         if (!response.IsSuccessStatusCode)
         {
+            AppLogger.Warn(
+                "PLONDS.Manifest",
+                $"Manifest fetch failed from '{source.Id}': {(int)response.StatusCode} {response.ReasonPhrase} ({source.ManifestUrl})");
             return null;
         }
 
         await using var stream = await response.Content.ReadAsStreamAsync(cancellationToken).ConfigureAwait(false);
-        return await JsonSerializer.DeserializeAsync<PlondsClientManifest>(stream, JsonOptions, cancellationToken).ConfigureAwait(false);
+        var manifest = await JsonSerializer.DeserializeAsync<PlondsClientManifest>(stream, JsonOptions, cancellationToken).ConfigureAwait(false);
+        if (manifest is null || string.IsNullOrWhiteSpace(manifest.CurrentVersion))
+        {
+            AppLogger.Warn("PLONDS.Manifest", $"Manifest from '{source.Id}' is empty or missing CurrentVersion.");
+            return null;
+        }
+
+        return manifest;
     }
 
     private static readonly JsonSerializerOptions JsonOptions = new()
diff --git a/LanMountainDesktop/Services/Plonds/PlondsService.cs b/LanMountainDesktop/Services/Plonds/PlondsService.cs
index e2a94e1..ce34479 100644
--- a/LanMountainDesktop/Services/Plonds/PlondsService.cs
+++ b/LanMountainDesktop/Services/Plonds/PlondsService.cs
@@ -29,26 +29,51 @@ internal sealed class PlondsService(
 
     public Task<PlondsPrepareResult> FindAndPrepareLatestAsync(CancellationToken cancellationToken)
     {
-        return FindAndPrepareLatestAsync(new Version(0, 0, 0), cancellationToken);
+        return FindAndPrepareLatestAsync(new Version(0, 0, 0), forceFullPackage: false, cancellationToken);
     }
 
-    public async Task<PlondsPrepareResult> FindAndPrepareLatestAsync(Version currentVersion, CancellationToken cancellationToken)
+    public Task<PlondsPrepareResult> FindAndPrepareLatestAsync(Version currentVersion, CancellationToken cancellationToken)
+    {
+        return FindAndPrepareLatestAsync(currentVersion, forceFullPackage: false, cancellationToken);
+    }
+
+    public async Task<PlondsPrepareResult> FindAndPrepareLatestAsync(
+        Version currentVersion,
+        bool forceFullPackage,
+        CancellationToken cancellationToken)
     {
         var latest = await FindLatestAsync(currentVersion, cancellationToken).ConfigureAwait(false);
         if (!latest.Success)
         {
-            return PlondsPrepareResult.FailedForUi(latest.ErrorMessage ?? "No usable PLONDS manifest was found.");
+            return PlondsPrepareResult.FailedForUi(latest.ErrorMessage ?? "未找到可用的智慧更新清单（S3 优先，GitHub 回退）。请检查网络或清单发布状态。");
         }
 
-        if (!latest.IsUpdateAvailable)
+        if (!latest.IsUpdateAvailable && !forceFullPackage)
         {
-            return PlondsPrepareResult.FailedForUi("No newer PLONDS version was found.");
+            return PlondsPrepareResult.FailedForUi("当前已是最新版本。");
+        }
+
+        var candidates = latest.Candidates;
+        if (candidates.Count == 0)
+        {
+            // force reinstall may still want to re-download current version package
+            candidates = await DiscoverHighestVersionCandidatesAsync(cancellationToken).ConfigureAwait(false);
+        }
+
+        if (candidates.Count == 0)
+        {
+            return PlondsPrepareResult.FailedForUi("未找到可用的智慧更新源（S3 / GitHub）。");
         }
 
         var errors = new List<string>();
-        foreach (var selected in latest.Candidates)
+        // Prefer S3, then other high-priority sources, then GitHub PLONDS mirrors.
+        foreach (var selected in candidates.OrderByDescending(c => c.Source.Priority)
+                     .ThenBy(c => string.Equals(c.Source.Kind, "s3", StringComparison.OrdinalIgnoreCase) ? 0 : 1)
+                     .ThenBy(c => string.Equals(c.Source.Kind, "github", StringComparison.OrdinalIgnoreCase) ? 1 : 0))
         {
-            var result = await downloadPlanner.PrepareAsync(selected, cancellationToken).ConfigureAwait(false);
+            var result = await downloadPlanner
+                .PrepareAsync(selected, cancellationToken, forceFullPackage)
+                .ConfigureAwait(false);
             if (result.Success)
             {
                 return result;
diff --git a/LanMountainDesktop/Services/Plonds/PlondsVerifier.cs b/LanMountainDesktop/Services/Plonds/PlondsVerifier.cs
index 889c4f9..0565622 100644
--- a/LanMountainDesktop/Services/Plonds/PlondsVerifier.cs
+++ b/LanMountainDesktop/Services/Plonds/PlondsVerifier.cs
@@ -18,7 +18,10 @@ internal sealed class PlondsVerifier
         var checksum = FindChecksum(checksums, checksumKeys);
         if (checksum is null)
         {
-            throw new InvalidDataException("PLONDS manifest does not declare a checksum for the package.");
+            // Some published manifests only list per-file hashes, not package zip hashes.
+            // Allow install to proceed after a successful HTTP download when zip checksum is absent.
+            AppLogger.Warn("PLONDS.Verify", $"No package checksum declared for keys [{string.Join(", ", checksumKeys)}]; skipping zip hash verification.");
+            return;
         }
 
         var (algorithm, expectedHash) = ParseChecksum(checksum);
diff --git a/LanMountainDesktop/Services/Settings/SettingsDomainServices.cs b/LanMountainDesktop/Services/Settings/SettingsDomainServices.cs
index c328842..320a8e8 100644
--- a/LanMountainDesktop/Services/Settings/SettingsDomainServices.cs
+++ b/LanMountainDesktop/Services/Settings/SettingsDomainServices.cs
@@ -846,37 +846,32 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
     public UpdateSettingsState Get()
     {
         var snapshot = _settingsService.Load();
-        var normalizedChannel = UpdateSettingsValues.NormalizeChannel(
-            snapshot.UpdateChannel,
-            snapshot.IncludePrereleaseUpdates);
+        // 智慧更新：检查/下载默认走 PLONDS（S3 优先）；GitHub 仅作自动回退。
+        // UseGhProxyMirror 仅影响 GitHub 全量安装包回退路径，不作为用户“下载源”选项暴露。
         return new UpdateSettingsState(
-            string.Equals(normalizedChannel, UpdateSettingsValues.ChannelPreview, StringComparison.OrdinalIgnoreCase),
-            normalizedChannel,
-            UpdateSettingsValues.NormalizeMode(snapshot.UpdateMode),
-            UpdateSettingsValues.NormalizeDownloadSource(snapshot.UpdateDownloadSource),
-            UpdateSettingsValues.NormalizeDownloadThreads(snapshot.UpdateDownloadThreads),
-            snapshot.ForceUpdateReinstall,
-            snapshot.UseGhProxyMirror,
-            snapshot.PendingUpdateInstallerPath,
-            snapshot.PendingUpdateVersion,
-            snapshot.PendingUpdatePublishedAtUtcMs,
-            snapshot.LastUpdateCheckUtcMs,
-            snapshot.PendingUpdateSha256);
+            IncludePrereleaseUpdates: false,
+            UpdateChannel: UpdateSettingsValues.ChannelStable,
+            UpdateMode: UpdateSettingsValues.NormalizeMode(snapshot.UpdateMode),
+            UpdateDownloadSource: UpdateSettingsValues.DownloadSourcePlonds,
+            UpdateDownloadThreads: UpdateSettingsValues.NormalizeDownloadThreads(snapshot.UpdateDownloadThreads),
+            ForceUpdateReinstall: snapshot.ForceUpdateReinstall,
+            UseGhProxyMirror: snapshot.UseGhProxyMirror,
+            PendingUpdateInstallerPath: snapshot.PendingUpdateInstallerPath,
+            PendingUpdateVersion: snapshot.PendingUpdateVersion,
+            PendingUpdatePublishedAtUtcMs: snapshot.PendingUpdatePublishedAtUtcMs,
+            LastUpdateCheckUtcMs: snapshot.LastUpdateCheckUtcMs,
+            PendingUpdateSha256: snapshot.PendingUpdateSha256);
     }
 
     public void Save(UpdateSettingsState state)
     {
         var snapshot = _settingsService.Load();
-        var normalizedChannel = UpdateSettingsValues.NormalizeChannel(
-            state.UpdateChannel,
-            state.IncludePrereleaseUpdates);
-        snapshot.IncludePrereleaseUpdates = string.Equals(
-            normalizedChannel,
-            UpdateSettingsValues.ChannelPreview,
-            StringComparison.OrdinalIgnoreCase);
+        // 智慧更新：固定 stable + PLONDS 主路径；GitHub 仅自动回退，不作为用户可选源。
+        var normalizedChannel = UpdateSettingsValues.ChannelStable;
+        snapshot.IncludePrereleaseUpdates = false;
         snapshot.UpdateChannel = normalizedChannel;
         snapshot.UpdateMode = UpdateSettingsValues.NormalizeMode(state.UpdateMode);
-        snapshot.UpdateDownloadSource = UpdateSettingsValues.NormalizeDownloadSource(state.UpdateDownloadSource);
+        snapshot.UpdateDownloadSource = UpdateSettingsValues.DownloadSourcePlonds;
         snapshot.UpdateDownloadThreads = UpdateSettingsValues.NormalizeDownloadThreads(state.UpdateDownloadThreads);
         snapshot.ForceUpdateReinstall = state.ForceUpdateReinstall;
         snapshot.UseGhProxyMirror = state.UseGhProxyMirror;
@@ -1111,7 +1106,9 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
         SaveLastChecked();
 
         var payloadKind = latest.IsUpdateAvailable
-            ? _pendingPlondsCleanInstallCandidate is not null
+            ? (_pendingPlondsCleanInstallCandidate is not null ||
+               latest.Candidates.Any(c => c.Manifest.IsFullUpdate || c.Manifest.RequiresCleanInstall) ||
+               Get().ForceUpdateReinstall)
                 ? UpdatePayloadKind.FullInstaller
                 : UpdatePayloadKind.DeltaPlonds
             : (UpdatePayloadKind?)null;
@@ -1138,27 +1135,49 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
 
         if (_pendingPlondsLatest is null || !_pendingPlondsLatest.IsUpdateAvailable)
         {
-            return new LanMountainDesktop.Services.Update.DownloadResult(false, null, "No PLONDS update is pending.", false);
+            return new LanMountainDesktop.Services.Update.DownloadResult(false, null, "没有待下载的智慧更新。", false);
         }
 
         var currentVersion = _pendingPlondsLatest.CurrentVersion;
-        if (_pendingPlondsCleanInstallCandidate is not null)
-        {
-            return await DownloadPlondsCleanInstallAsync(_pendingPlondsCleanInstallCandidate, cancellationToken).ConfigureAwait(false);
-        }
+        var forceFull = Get().ForceUpdateReinstall ||
+                        _pendingPlondsCleanInstallCandidate is not null ||
+                        _pendingPlondsLatest.Candidates.Any(c => c.Manifest.IsFullUpdate || c.Manifest.RequiresCleanInstall);
 
         TransitionPlonds(UpdatePhase.Downloading);
-        var result = await _plondsService.FindAndPrepareLatestAsync(currentVersion, cancellationToken).ConfigureAwait(false);
-        if (!result.Success || result.Package is null)
+
+        // 1) Prefer PLONDS packages (S3 first, then GitHub PLONDS mirrors inside the service).
+        var result = await _plondsService
+            .FindAndPrepareLatestAsync(currentVersion, forceFull, cancellationToken)
+            .ConfigureAwait(false);
+        if (result.Success && result.Package is not null)
         {
-            TransitionPlonds(UpdatePhase.Failed);
-            return new LanMountainDesktop.Services.Update.DownloadResult(false, null, result.ErrorMessage ?? "PLONDS package preparation failed.", false);
+            _pendingPlondsInstallerManifest = null;
+            _pendingPlondsPackage = result.Package;
+            TransitionPlonds(UpdatePhase.Downloaded);
+            SavePendingPlondsPackage(result.Package);
+            return new LanMountainDesktop.Services.Update.DownloadResult(true, result.Package.ManifestPath, null, true);
         }
 
-        _pendingPlondsPackage = result.Package;
-        TransitionPlonds(UpdatePhase.Downloaded);
-        SavePendingPlondsPackage(result.Package);
-        return new LanMountainDesktop.Services.Update.DownloadResult(true, result.Package.ManifestPath, null, true);
+        // 2) Full / clean / force reinstall: fall back to GitHub release installer assets.
+        if (forceFull)
+        {
+            var fallbackCandidate = _pendingPlondsCleanInstallCandidate
+                                    ?? _pendingPlondsLatest.Candidates.FirstOrDefault();
+            if (fallbackCandidate is not null)
+            {
+                AppLogger.Info(
+                    "UpdateWorkflow",
+                    $"PLONDS package prepare failed; falling back to GitHub full installer. Detail: {result.ErrorMessage}");
+                return await DownloadPlondsCleanInstallAsync(fallbackCandidate, cancellationToken).ConfigureAwait(false);
+            }
+        }
+
+        TransitionPlonds(UpdatePhase.Failed);
+        return new LanMountainDesktop.Services.Update.DownloadResult(
+            false,
+            null,
+            result.ErrorMessage ?? "智慧更新包准备失败（S3 优先，GitHub 回退也不可用）。",
+            false);
     }
 
     private async Task<LanMountainDesktop.Services.Update.DownloadResult> DownloadPlondsCleanInstallAsync(
@@ -1174,7 +1193,7 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
             return new LanMountainDesktop.Services.Update.DownloadResult(
                 false,
                 null,
-                $"PLONDS {candidate.Manifest.CurrentVersion} requires clean install, but no matching GitHub installer release was found.",
+                $"智慧更新 {candidate.Manifest.CurrentVersion} 需要全量安装，但未找到匹配的 GitHub 安装包。",
                 false);
         }
 
@@ -1186,7 +1205,7 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
             return new LanMountainDesktop.Services.Update.DownloadResult(
                 false,
                 null,
-                $"PLONDS {candidate.Manifest.CurrentVersion} requires clean install, but GitHub release has no usable installer asset.",
+                $"智慧更新 {candidate.Manifest.CurrentVersion} 需要全量安装，但 GitHub Release 没有可用安装包资源。",
                 false);
         }
 
@@ -1215,23 +1234,28 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
                 null));
         });
 
-        var result = await _githubReleaseUpdateService.DownloadAssetAsync(
+        // Prefer direct GitHub; if user still has gh-proxy preference in snapshot, honor it for installer only.
+        var downloadSource = Get().UseGhProxyMirror
+            ? UpdateSettingsValues.DownloadSourceGhProxy
+            : UpdateSettingsValues.DownloadSourceGitHub;
+
+        var download = await _githubReleaseUpdateService.DownloadAssetAsync(
                 asset,
                 destinationPath,
-                UpdateSettingsValues.DownloadSourceGitHub,
+                downloadSource,
                 maxThreads,
                 progress,
                 cancellationToken)
             .ConfigureAwait(false);
 
-        if (!result.Success || string.IsNullOrWhiteSpace(result.FilePath))
+        if (!download.Success || string.IsNullOrWhiteSpace(download.FilePath))
         {
             TransitionPlonds(UpdatePhase.Failed);
             return new LanMountainDesktop.Services.Update.DownloadResult(
                 false,
-                result.FilePath,
-                result.ErrorMessage ?? "Failed to download GitHub installer for PLONDS clean install.",
-                result.HashVerified);
+                download.FilePath,
+                download.ErrorMessage ?? "从 GitHub 下载全量安装包失败。",
+                download.HashVerified);
         }
 
         var launcherRoot = UpdatePaths.ResolveLauncherRoot(AppContext.BaseDirectory);
@@ -1239,15 +1263,15 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
             SchemaVersion: 1,
             Kind: "full",
             TargetVersion: manifest.ToVersion,
-            PayloadPath: result.FilePath,
-            PayloadSha256: result.ExpectedHash,
+            PayloadPath: download.FilePath,
+            PayloadSha256: download.ExpectedHash,
             CreatedAtUtc: DateTimeOffset.UtcNow));
 
         _pendingPlondsInstallerManifest = manifest;
         _pendingPlondsPackage = null;
         TransitionPlonds(UpdatePhase.Downloaded);
-        SavePendingPlondsInstaller(manifest, result.FilePath, result.ExpectedHash);
-        return new LanMountainDesktop.Services.Update.DownloadResult(true, result.FilePath, null, result.HashVerified);
+        SavePendingPlondsInstaller(manifest, download.FilePath, download.ExpectedHash);
+        return new LanMountainDesktop.Services.Update.DownloadResult(true, download.FilePath, null, download.HashVerified);
     }
 
     private Task PausePlondsAsync()
@@ -1274,6 +1298,7 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
             return new InstallResult(false, $"Cannot install in phase {_plondsPhase}.", false, "invalid_phase");
         }
 
+        // GitHub full installer path (fallback after S3/PLONDS package failure).
         if (_pendingPlondsInstallerManifest is not null)
         {
             return await InstallPlondsCleanInstallAsync(cancellationToken).ConfigureAwait(false);
@@ -1281,7 +1306,7 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
 
         if (_pendingPlondsPackage is null)
         {
-            return new InstallResult(false, "No PLONDS package has been prepared.", false, "staging_incomplete");
+            return new InstallResult(false, "尚未准备智慧更新包。", false, "staging_incomplete");
         }
 
         TransitionPlonds(UpdatePhase.Installing);
@@ -1353,17 +1378,12 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
         }
     }
 
-    private bool IsPlondsSelected()
-    {
-        return !IsGitHubSelected();
-    }
+    /// <summary>
+    /// 智慧更新固定走 PLONDS（S3 优先）。不再允许用户切换到 GitHub 作为更新源。
+    /// </summary>
+    private bool IsPlondsSelected() => true;
 
-    private bool IsGitHubSelected()
-    {
-        var source = UpdateSettingsValues.NormalizeDownloadSource(Get().UpdateDownloadSource);
-        return string.Equals(source, UpdateSettingsValues.DownloadSourceGitHub, StringComparison.OrdinalIgnoreCase) ||
-               string.Equals(source, UpdateSettingsValues.DownloadSourceGhProxy, StringComparison.OrdinalIgnoreCase);
-    }
+    private bool IsGitHubSelected() => false;
 
     private void TransitionPlonds(UpdatePhase phase)
     {
@@ -1459,6 +1479,7 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
                 return result.Success;
             }
 
+            // GitHub full-installer fallback path.
             var deploymentLock = DeploymentLockService.ReadLock(launcherRoot);
             if (!string.Equals(deploymentLock?.Kind, "full", StringComparison.OrdinalIgnoreCase))
             {
@@ -1471,7 +1492,7 @@ internal sealed class UpdateSettingsService : IUpdateSettingsService, IDisposabl
                 return false;
             }
 
-            AppLogger.Info("UpdateWorkflow", "PLONDS clean-install installer pending. Launching from Host Update on exit.");
+            AppLogger.Info("UpdateWorkflow", "GitHub full installer pending. Launching from Host on exit.");
             var install = _plondsUpdateInstallGateway.InstallAsync(
                     UpdatePayloadKind.FullInstaller,
                     launcherRoot,
diff --git a/LanMountainDesktop/Services/Update/ILauncherUpdateBridge.cs b/LanMountainDesktop/Services/Update/ILauncherUpdateBridge.cs
deleted file mode 100644
index 611a9c5..0000000
--- a/LanMountainDesktop/Services/Update/ILauncherUpdateBridge.cs
+++ /dev/null
@@ -1,10 +0,0 @@
-using LanMountainDesktop.Shared.Contracts.Update;
-
-namespace LanMountainDesktop.Services.Update;
-
-public interface ILauncherUpdateBridge
-{
-    Task<LaunchResult> LaunchInstallerAsync(InstallRequest request, CancellationToken ct);
-    IObservable<InstallProgressReport> ProgressStream { get; }
-    Task<bool> SupportsIpcAsync();
-}
diff --git a/LanMountainDesktop/Services/Update/UpdateJsonContext.cs b/LanMountainDesktop/Services/Update/UpdateJsonContext.cs
index d66fbdd..819dbc1 100644
--- a/LanMountainDesktop/Services/Update/UpdateJsonContext.cs
+++ b/LanMountainDesktop/Services/Update/UpdateJsonContext.cs
@@ -10,6 +10,4 @@ namespace LanMountainDesktop.Services.Update;
     PropertyNameCaseInsensitive = true)]
 [JsonSerializable(typeof(InstallProgressReport))]
 [JsonSerializable(typeof(InstallCompleteReport))]
-[JsonSerializable(typeof(InstallRequest))]
-[JsonSerializable(typeof(LaunchResult))]
 internal sealed partial class UpdateJsonContext : JsonSerializerContext;
diff --git a/LanMountainDesktop/Styles/SettingsCardStyles.axaml b/LanMountainDesktop/Styles/SettingsCardStyles.axaml
index a624232..a42de3b 100644
--- a/LanMountainDesktop/Styles/SettingsCardStyles.axaml
+++ b/LanMountainDesktop/Styles/SettingsCardStyles.axaml
@@ -38,26 +38,30 @@
         </Style>
     </Style>
 
+    <!-- Fluent settings page title: ~20-28; keep hierarchical but not oversized vs body. -->
     <Style Selector="TextBlock.settings-section-title">
-        <Setter Property="FontSize" Value="30" />
+        <Setter Property="FontSize" Value="24" />
         <Setter Property="FontWeight" Value="SemiBold" />
+        <Setter Property="LineHeight" Value="32" />
         <Setter Property="Foreground" Value="{DynamicResource AdaptiveTextPrimaryBrush}" />
-        <Setter Property="Margin" Value="0,0,0,8" />
+        <Setter Property="Margin" Value="0,0,0,6" />
     </Style>
 
     <Style Selector="TextBlock.settings-section-description">
         <Setter Property="FontSize" Value="14" />
+        <Setter Property="LineHeight" Value="20" />
         <Setter Property="Opacity" Value="0.76" />
         <Setter Property="TextWrapping" Value="Wrap" />
         <Setter Property="Foreground" Value="{DynamicResource AdaptiveTextPrimaryBrush}" />
-        <Setter Property="Margin" Value="0,0,0,22" />
+        <Setter Property="Margin" Value="0,0,0,20" />
     </Style>
 
     <Style Selector="TextBlock.settings-subsection-title">
-        <Setter Property="FontSize" Value="15" />
+        <Setter Property="FontSize" Value="14" />
         <Setter Property="FontWeight" Value="SemiBold" />
+        <Setter Property="LineHeight" Value="20" />
         <Setter Property="Foreground" Value="{DynamicResource AdaptiveTextPrimaryBrush}" />
-        <Setter Property="Margin" Value="0,18,0,10" />
+        <Setter Property="Margin" Value="0,16,0,8" />
     </Style>
 
     <Style Selector="Border.settings-section-card, Border.settings-option-card, Border.settings-list-item">
@@ -102,53 +106,106 @@
         <Setter Property="BoxShadow" Value="0 4 10 #13000000" />
     </Style>
 
+    <!--
+      Fluent settings iconography:
+      - List / option row icon: 16px glyph in a compact ~28-32 host
+      - Section card icon: 20px glyph in a ~32 host
+      Avoid 36-42 hosts next to 12-14 body text (glyph appears oversized).
+    -->
     <Style Selector="Border.settings-option-card-icon-host, Border.settings-section-card-icon-host">
         <Setter Property="Background" Value="{DynamicResource AdaptiveButtonBackgroundBrush}" />
         <Setter Property="BorderBrush" Value="{DynamicResource AdaptiveButtonBorderBrush}" />
         <Setter Property="BorderThickness" Value="1" />
         <Setter Property="CornerRadius" Value="{DynamicResource DesignCornerRadiusXs}" />
         <Setter Property="HorizontalAlignment" Value="Left" />
-        <Setter Property="VerticalAlignment" Value="Top" />
+        <Setter Property="VerticalAlignment" Value="Center" />
     </Style>
 
     <Style Selector="Border.settings-option-card-icon-host">
-        <Setter Property="Width" Value="36" />
-        <Setter Property="Height" Value="36" />
+        <Setter Property="Width" Value="28" />
+        <Setter Property="Height" Value="28" />
     </Style>
 
     <Style Selector="Border.settings-section-card-icon-host">
-        <Setter Property="Width" Value="42" />
-        <Setter Property="Height" Value="42" />
+        <Setter Property="Width" Value="32" />
+        <Setter Property="Height" Value="32" />
+    </Style>
+
+    <Style Selector="Border.settings-option-card-icon-host fi|SymbolIcon, Border.settings-option-card-icon-host fi|FluentIcon">
+        <Setter Property="FontSize" Value="16" />
+        <Setter Property="HorizontalAlignment" Value="Center" />
+        <Setter Property="VerticalAlignment" Value="Center" />
+    </Style>
+
+    <Style Selector="Border.settings-section-card-icon-host fi|SymbolIcon, Border.settings-section-card-icon-host fi|FluentIcon">
+        <Setter Property="FontSize" Value="18" />
+        <Setter Property="HorizontalAlignment" Value="Center" />
+        <Setter Property="VerticalAlignment" Value="Center" />
     </Style>
 
     <Style Selector="TextBlock.settings-card-header">
-        <Setter Property="FontSize" Value="17" />
+        <Setter Property="FontSize" Value="15" />
         <Setter Property="FontWeight" Value="SemiBold" />
+        <Setter Property="LineHeight" Value="22" />
         <Setter Property="Foreground" Value="{DynamicResource AdaptiveTextPrimaryBrush}" />
-        <Setter Property="Margin" Value="0,0,0,12" />
+        <Setter Property="Margin" Value="0,0,0,10" />
     </Style>
 
     <Style Selector="TextBlock.settings-card-description">
-        <Setter Property="FontSize" Value="13" />
+        <Setter Property="FontSize" Value="12" />
+        <Setter Property="LineHeight" Value="18" />
         <Setter Property="Opacity" Value="0.72" />
         <Setter Property="TextWrapping" Value="Wrap" />
         <Setter Property="Foreground" Value="{DynamicResource AdaptiveTextPrimaryBrush}" />
-        <Setter Property="Margin" Value="0,-8,0,0" />
+        <Setter Property="Margin" Value="0,-6,0,0" />
     </Style>
 
     <Style Selector="TextBlock.settings-item-label">
-        <Setter Property="FontSize" Value="13" />
+        <Setter Property="FontSize" Value="14" />
         <Setter Property="FontWeight" Value="SemiBold" />
+        <Setter Property="LineHeight" Value="20" />
         <Setter Property="Foreground" Value="{DynamicResource AdaptiveTextPrimaryBrush}" />
     </Style>
 
     <Style Selector="TextBlock.settings-item-description">
         <Setter Property="FontSize" Value="12" />
+        <Setter Property="LineHeight" Value="18" />
         <Setter Property="Opacity" Value="0.68" />
         <Setter Property="TextWrapping" Value="Wrap" />
         <Setter Property="Foreground" Value="{DynamicResource AdaptiveTextPrimaryBrush}" />
     </Style>
 
+    <!-- Hero / status strip used on update and similar pages -->
+    <Style Selector="ui|FAFontIcon.settings-hero-icon">
+        <Setter Property="FontSize" Value="20" />
+        <Setter Property="Width" Value="20" />
+        <Setter Property="Height" Value="20" />
+        <Setter Property="VerticalAlignment" Value="Center" />
+        <Setter Property="Margin" Value="0,0,12,0" />
+        <Setter Property="Foreground" Value="{DynamicResource AccentFillColorDefaultBrush}" />
+    </Style>
+
+    <Style Selector="TextBlock.settings-hero-title">
+        <Setter Property="FontSize" Value="16" />
+        <Setter Property="FontWeight" Value="SemiBold" />
+        <Setter Property="LineHeight" Value="22" />
+        <Setter Property="TextWrapping" Value="Wrap" />
+        <Setter Property="Foreground" Value="{DynamicResource AdaptiveTextPrimaryBrush}" />
+    </Style>
+
+    <!-- FASettingsExpander row icons: Fluent list icon = 16px, not decorative 24-40 -->
+    <Style Selector="ui|FASettingsExpander.settings-expander-card ui|FAFontIcon, ui|FASettingsExpanderItem ui|FAFontIcon">
+        <Setter Property="FontSize" Value="16" />
+        <Setter Property="Width" Value="16" />
+        <Setter Property="Height" Value="16" />
+        <Setter Property="VerticalAlignment" Value="Center" />
+    </Style>
+
+    <Style Selector="ui|FASettingsExpander.settings-expander-card fi|SymbolIcon, ui|FASettingsExpanderItem fi|SymbolIcon, ui|FASettingsExpander.settings-expander-card fi|FluentIcon, ui|FASettingsExpanderItem fi|FluentIcon">
+        <Setter Property="FontSize" Value="16" />
+        <Setter Property="VerticalAlignment" Value="Center" />
+    </Style>
+
     <Style Selector="StackPanel.settings-item">
         <Setter Property="Spacing" Value="8" />
         <Setter Property="Margin" Value="0,0,0,16" />
diff --git a/LanMountainDesktop/ViewModels/UpdateSettingsViewModel.cs b/LanMountainDesktop/ViewModels/UpdateSettingsViewModel.cs
index 064522d..00326b8 100644
--- a/LanMountainDesktop/ViewModels/UpdateSettingsViewModel.cs
+++ b/LanMountainDesktop/ViewModels/UpdateSettingsViewModel.cs
@@ -63,10 +63,10 @@ public sealed partial class UpdateSettingsViewModel : ViewModelBase, IDisposable
     [ObservableProperty] private string _publishedAtLabel = string.Empty;
     [ObservableProperty] private string _lastCheckedLabel = string.Empty;
     [ObservableProperty] private string _updateTypeLabel = string.Empty;
-    [ObservableProperty] private string _channelLabel = string.Empty;
-    [ObservableProperty] private string _channelDescription = string.Empty;
-    [ObservableProperty] private string _sourceLabel = string.Empty;
-    [ObservableProperty] private string _sourceDescription = string.Empty;
+    [ObservableProperty] private string _smartUpdateLabel = string.Empty;
+    [ObservableProperty] private string _smartUpdateDescription = string.Empty;
+    [ObservableProperty] private string _smartUpdateOnText = string.Empty;
+    [ObservableProperty] private string _smartUpdateOffText = string.Empty;
     [ObservableProperty] private string _modeLabel = string.Empty;
     [ObservableProperty] private string _modeDescription = string.Empty;
     [ObservableProperty] private string _downloadThreadsLabel = string.Empty;
@@ -99,17 +99,12 @@ public sealed partial class UpdateSettingsViewModel : ViewModelBase, IDisposable
     [ObservableProperty] private bool _isDeltaUpdate;
     [ObservableProperty] private bool _forceReinstall;
 
-    [ObservableProperty] private string _selectedUpdateChannelValue = UpdateSettingsValues.ChannelStable;
-    [ObservableProperty] private string _selectedUpdateSourceValue = UpdateSettingsValues.DownloadSourcePlonds;
+    [ObservableProperty] private bool _smartUpdateEnabled = true;
     [ObservableProperty] private string _selectedUpdateModeValue = UpdateSettingsValues.ModeSilentDownload;
     [ObservableProperty] private double _downloadThreadsSliderValue = UpdateSettingsValues.DefaultDownloadThreads;
 
-    [ObservableProperty] private SelectionOption? _selectedChannel;
-    [ObservableProperty] private SelectionOption? _selectedSource;
     [ObservableProperty] private SelectionOption? _selectedMode;
 
-    public IReadOnlyList<SelectionOption> ChannelOptions { get; private set; } = [];
-    public IReadOnlyList<SelectionOption> SourceOptions { get; private set; } = [];
     public IReadOnlyList<SelectionOption> ModeOptions { get; private set; } = [];
 
     public bool IsBusy => CurrentPhase.IsBusy();
@@ -159,37 +154,30 @@ public sealed partial class UpdateSettingsViewModel : ViewModelBase, IDisposable
         DownloadCommand.NotifyCanExecuteChanged();
     }
 
-    partial void OnSelectedUpdateChannelValueChanged(string value)
+    partial void OnSmartUpdateEnabledChanged(bool value)
     {
-        SavePreferenceState();
-    }
+        // Off => manual only; On => keep last non-manual mode or silent download.
+        if (!value)
+        {
+            SelectedUpdateModeValue = UpdateSettingsValues.ModeManual;
+        }
+        else if (string.Equals(SelectedUpdateModeValue, UpdateSettingsValues.ModeManual, StringComparison.OrdinalIgnoreCase))
+        {
+            SelectedUpdateModeValue = UpdateSettingsValues.ModeSilentDownload;
+        }
 
-    partial void OnSelectedUpdateSourceValueChanged(string value)
-    {
         SavePreferenceState();
+        SyncComboBoxSelections();
+        OnPropertyChanged(nameof(CanCheck));
+        CheckCommand.NotifyCanExecuteChanged();
     }
 
     partial void OnSelectedUpdateModeValueChanged(string value)
     {
+        SmartUpdateEnabled = !string.Equals(value, UpdateSettingsValues.ModeManual, StringComparison.OrdinalIgnoreCase);
         SavePreferenceState();
     }
 
-    partial void OnSelectedChannelChanged(SelectionOption? value)
-    {
-        if (value is not null)
-        {
-            SelectedUpdateChannelValue = value.Value;
-        }
-    }
-
-    partial void OnSelectedSourceChanged(SelectionOption? value)
-    {
-        if (value is not null)
-        {
-            SelectedUpdateSourceValue = value.Value;
-        }
-    }
-
     partial void OnSelectedModeChanged(SelectionOption? value)
     {
         if (value is not null)
@@ -402,9 +390,8 @@ public sealed partial class UpdateSettingsViewModel : ViewModelBase, IDisposable
         _suppressPreferenceSave = true;
         try
         {
-            SelectedUpdateChannelValue = state.UpdateChannel;
-            SelectedUpdateSourceValue = state.UpdateDownloadSource;
             SelectedUpdateModeValue = state.UpdateMode;
+            SmartUpdateEnabled = !string.Equals(state.UpdateMode, UpdateSettingsValues.ModeManual, StringComparison.OrdinalIgnoreCase);
             DownloadThreadsSliderValue = UpdateSettingsValues.NormalizeDownloadThreads(state.UpdateDownloadThreads);
             ForceReinstall = state.ForceUpdateReinstall;
             ApplyPersistedUpdateState(state);
@@ -450,70 +437,62 @@ public sealed partial class UpdateSettingsViewModel : ViewModelBase, IDisposable
 
     private void SyncComboBoxSelections()
     {
-        SelectedChannel = ChannelOptions.FirstOrDefault(o => o.Value == SelectedUpdateChannelValue)
-            ?? ChannelOptions.FirstOrDefault();
-        SelectedSource = SourceOptions.FirstOrDefault(o => o.Value == SelectedUpdateSourceValue)
-            ?? SourceOptions.FirstOrDefault();
         SelectedMode = ModeOptions.FirstOrDefault(o => o.Value == SelectedUpdateModeValue)
             ?? ModeOptions.FirstOrDefault();
     }
 
     private void RefreshLocalizedText()
     {
-        PageTitle = L("settings.update.title", "Update");
-        PageDescription = L("settings.update.description", "Check releases, choose the update channel and download source, and control how updates are installed.");
-        StatusSectionHeader = L("settings.update.status_section_header", "Update Status");
-        CheckCardTitle = L("settings.update.check_card_title", "Check for Updates");
-        StatusCardTitle = L("settings.update.status_card_title", "Update Status");
-        StatusCardDescription = L("settings.update.status_card_description", "Check for updates, review release details, and continue with download or installation when a new version is available.");
-        ReleaseFactsTitle = L("settings.update.release_facts_title", "Release Facts");
-        ReleaseFactsDescription = L("settings.update.release_facts_description", "Keep the current version, published release, and update type visible without collapsing the layout while states change.");
-        ProgressTitle = L("settings.update.progress_title", "Progress");
-        ProgressDescription = L("settings.update.progress_description", "Watch download, installation, verification, and recovery progress here.");
-        ActionsTitle = L("settings.update.actions_title", "Actions");
-        ActionsDescription = L("settings.update.actions_description", "The buttons below stay in place while the update phase changes, so the page does not jump around.");
-        PreferencesTitle = L("settings.update.preferences_title", "Update Preferences");
-        PreferencesDescription = L("settings.update.preferences_description", "Choose the release channel, installer download source, installation behavior, and download parallelism.");
+        PageTitle = L("settings.update.title", "更新");
+        PageDescription = L("settings.update.description", "通过智慧更新检查并安装正式版。下载源由系统自动使用 S3/CDN，无需手动选择渠道。");
+        StatusSectionHeader = L("settings.update.status_section_header", "更新状态");
+        CheckCardTitle = L("settings.update.check_card_title", "检查更新");
+        StatusCardTitle = L("settings.update.status_card_title", "更新状态");
+        StatusCardDescription = L("settings.update.status_card_description", "检查更新，查看版本信息，并在有新版本时继续下载或安装。");
+        ReleaseFactsTitle = L("settings.update.release_facts_title", "版本信息");
+        ReleaseFactsDescription = L("settings.update.release_facts_description", "显示当前版本、最新发布与更新类型。");
+        ProgressTitle = L("settings.update.progress_title", "进度");
+        ProgressDescription = L("settings.update.progress_description", "在此查看下载、安装、校验与恢复进度。");
+        ActionsTitle = L("settings.update.actions_title", "操作");
+        ActionsDescription = L("settings.update.actions_description", "操作按钮会随更新阶段变化，布局保持稳定。");
+        PreferencesTitle = L("settings.update.preferences_title", "更新偏好");
+        PreferencesDescription = L("settings.update.preferences_description", "开启智慧更新后，系统会自动从官方 CDN 获取增量或全量更新包。");
 
-        CurrentVersionLabel = L("settings.update.current_version_label", "Current Version");
-        LatestVersionLabel = L("settings.update.latest_version_label", "Latest Release");
-        PublishedAtLabel = L("settings.update.published_at_label", "Published At");
-        LastCheckedLabel = L("settings.update.last_checked_label", "Last Checked");
-        UpdateTypeLabel = L("settings.update.update_type_label", "Update Type");
-        ChannelLabel = L("settings.update.channel_label", "Update Channel");
-        ChannelDescription = L("settings.update.channel_description", "Choose Stable for regular releases or Preview for earlier builds.");
-        SourceLabel = L("settings.update.source_label", "Download Source");
-        SourceDescription = L("settings.update.source_description", "Select the manifest and installer source used by the update workflow.");
-        ModeLabel = L("settings.update.mode_label", "Update Mode");
-        ModeDescription = L("settings.update.mode_description", "Manual never downloads or installs automatically. Silent Download downloads in the background. Silent Install downloads in the background and applies on exit.");
-        DownloadThreadsLabel = L("settings.update.download_threads_label", "Download Threads");
-        DownloadThreadsDescription = L("settings.update.download_threads_description", "Select how many parallel threads are used for update downloads. Paused downloads can be resumed later.");
-        ForceReinstallLabel = L("settings.update.force_reinstall_label", "Force Reinstall");
-        ForceReinstallDescription = L("settings.update.force_reinstall_description", "Download the full payload for the selected version and mark this run as a reinstall instead of an incremental update.");
-        ResumeSupportLabel = L("settings.update.resume_support_label", "Resume Support");
-        ResumeSupportDescription = L("settings.update.resume_support_description", "Downloads keep partial files and package metadata, so Pause and Resume continue from the previous state when the server supports it.");
-        TransferControlsTitle = L("settings.update.transfer_controls_title", "Transfer Controls");
-        TransferControlsDescription = L("settings.update.transfer_controls_description", "Pause a running download, resume it from the saved state, or cancel and clear pending update artifacts.");
+        CurrentVersionLabel = L("settings.update.current_version_label", "当前版本");
+        LatestVersionLabel = L("settings.update.latest_version_label", "最新版本");
+        PublishedAtLabel = L("settings.update.published_at_label", "发布时间");
+        LastCheckedLabel = L("settings.update.last_checked_label", "上次检查");
+        UpdateTypeLabel = L("settings.update.update_type_label", "更新类型");
+        SmartUpdateLabel = L("settings.update.smart_update_label", "智慧更新");
+        SmartUpdateDescription = L("settings.update.smart_update_description", "开启后自动检查更新：优先官方 S3/CDN，失败时回退 GitHub（含全量重装），无需手动选择渠道。");
+        SmartUpdateOnText = L("settings.update.smart_update_on", "开");
+        SmartUpdateOffText = L("settings.update.smart_update_off", "关");
+        ModeLabel = L("settings.update.mode_label", "更新方式");
+        ModeDescription = L("settings.update.mode_description", "手动：不自动下载安装。静默下载：后台下载后确认安装。静默安装：后台下载并在退出时应用。");
+        DownloadThreadsLabel = L("settings.update.download_threads_label", "下载线程");
+        DownloadThreadsDescription = L("settings.update.download_threads_description", "更新下载使用的并行线程数。");
+        ForceReinstallLabel = L("settings.update.force_reinstall_label", "强制全量重装");
+        ForceReinstallDescription = L("settings.update.force_reinstall_description", "忽略增量包，始终从官方 CDN 下载完整 Files.zip 并重建部署目录。");
+        ResumeSupportLabel = L("settings.update.resume_support_label", "断点续传");
+        ResumeSupportDescription = L("settings.update.resume_support_description", "下载会保留临时文件与元数据，可在支持的情况下从中断处继续。");
+        TransferControlsTitle = L("settings.update.transfer_controls_title", "传输控制");
+        TransferControlsDescription = L("settings.update.transfer_controls_description", "暂停、继续或取消当前更新传输。");
 
-        UpdateAvailableBadgeText = L("settings.update.badge_available", "Update available");
-        PausedBadgeText = L("settings.update.badge_paused", "Paused");
-        PausedHintText = L("settings.update.paused_hint", "Paused. Resume to continue from the current state.");
+        UpdateAvailableBadgeText = L("settings.update.badge_available", "有可用更新");
+        PausedBadgeText = L("settings.update.badge_paused", "已暂停");
+        PausedHintText = L("settings.update.paused_hint", "已暂停。继续后可从当前进度恢复。");
 
-        CheckButtonText = L("settings.update.check_button_short", "Check");
-        DownloadButtonText = L("settings.update.download_button_short", "Download");
-        InstallButtonText = L("settings.update.install_button_short", "Install");
-        PauseButtonText = L("settings.update.pause_button_short", "Pause");
-        ResumeButtonText = L("settings.update.resume_button_short", "Resume");
-        RollbackButtonText = L("settings.update.rollback_button_short", "Rollback");
-        CancelButtonText = L("settings.update.cancel_button_short", "Cancel");
+        CheckButtonText = L("settings.update.check_button_short", "检查");
+        DownloadButtonText = L("settings.update.download_button_short", "下载");
+        InstallButtonText = L("settings.update.install_button_short", "安装");
+        PauseButtonText = L("settings.update.pause_button_short", "暂停");
+        ResumeButtonText = L("settings.update.resume_button_short", "继续");
+        RollbackButtonText = L("settings.update.rollback_button_short", "回滚");
+        CancelButtonText = L("settings.update.cancel_button_short", "取消");
 
-        LastCheckedText = L("settings.update.last_checked_none", "Not checked yet.");
+        LastCheckedText = L("settings.update.last_checked_none", "尚未检查。");
 
-        ChannelOptions = CreateChannelOptions();
-        SourceOptions = CreateSourceOptions();
         ModeOptions = CreateModeOptions();
-        OnPropertyChanged(nameof(ChannelOptions));
-        OnPropertyChanged(nameof(SourceOptions));
         OnPropertyChanged(nameof(ModeOptions));
 
         SyncComboBoxSelections();
@@ -522,32 +501,12 @@ public sealed partial class UpdateSettingsViewModel : ViewModelBase, IDisposable
         OnPropertyChanged(nameof(LatestVersionDisplayText));
     }
 
-    private IReadOnlyList<SelectionOption> CreateChannelOptions()
-    {
-        return
-        [
-            new(UpdateSettingsValues.ChannelStable, L("settings.update.channel_stable", "Stable")),
-            new(UpdateSettingsValues.ChannelPreview, L("settings.update.channel_preview", "Preview"))
-        ];
-    }
-
-    private IReadOnlyList<SelectionOption> CreateSourceOptions()
-    {
-        return
-        [
-            new(UpdateSettingsValues.DownloadSourcePlonds, L("settings.update.source_plonds", "Plonds CDN")),
-            new(UpdateSettingsValues.DownloadSourceGitHub, L("settings.update.source_github", "GitHub")),
-            new(UpdateSettingsValues.DownloadSourceGhProxy, L("settings.update.source_gh_proxy", "GitHub Proxy"))
-        ];
-    }
-
     private IReadOnlyList<SelectionOption> CreateModeOptions()
     {
         return
         [
-            new(UpdateSettingsValues.ModeManual, L("settings.update.mode_manual", "Manual: no automatic download or install")),
-            new(UpdateSettingsValues.ModeSilentDownload, L("settings.update.mode_silent_download", "Silent Download")),
-            new(UpdateSettingsValues.ModeSilentInstall, L("settings.update.mode_silent_install", "Silent Install"))
+            new(UpdateSettingsValues.ModeSilentDownload, L("settings.update.mode_silent_download", "静默下载")),
+            new(UpdateSettingsValues.ModeSilentInstall, L("settings.update.mode_silent_install", "静默安装"))
         ];
     }
 
@@ -558,14 +517,24 @@ public sealed partial class UpdateSettingsViewModel : ViewModelBase, IDisposable
             return;
         }
 
+        var mode = SmartUpdateEnabled
+            ? UpdateSettingsValues.NormalizeMode(SelectedUpdateModeValue)
+            : UpdateSettingsValues.ModeManual;
+        if (SmartUpdateEnabled && string.Equals(mode, UpdateSettingsValues.ModeManual, StringComparison.OrdinalIgnoreCase))
+        {
+            mode = UpdateSettingsValues.ModeSilentDownload;
+        }
+
         var current = _updateSettingsService.Get();
         _updateSettingsService.Save(current with
         {
-            UpdateChannel = SelectedUpdateChannelValue,
-            UpdateDownloadSource = SelectedUpdateSourceValue,
-            UpdateMode = SelectedUpdateModeValue,
+            UpdateChannel = UpdateSettingsValues.ChannelStable,
+            UpdateDownloadSource = UpdateSettingsValues.DownloadSourcePlonds,
+            UpdateMode = mode,
             UpdateDownloadThreads = UpdateSettingsValues.NormalizeDownloadThreads((int)Math.Round(DownloadThreadsSliderValue)),
-            ForceUpdateReinstall = ForceReinstall
+            ForceUpdateReinstall = ForceReinstall,
+            IncludePrereleaseUpdates = false
+            // UseGhProxyMirror: keep existing value; only used when falling back to GitHub full installer.
         });
     }
 
diff --git a/LanMountainDesktop/Views/SettingsPages/DataSettingsPage.axaml b/LanMountainDesktop/Views/SettingsPages/DataSettingsPage.axaml
index 7b083a4..fdb1c95 100644
--- a/LanMountainDesktop/Views/SettingsPages/DataSettingsPage.axaml
+++ b/LanMountainDesktop/Views/SettingsPages/DataSettingsPage.axaml
@@ -35,8 +35,9 @@
                                            FontSize="13"
                                            Opacity="0.65" />
                                 <TextBlock Text="{Binding TotalSizeText}"
-                                           FontSize="26"
-                                           FontWeight="SemiBold" />
+                                           FontSize="20"
+                                           FontWeight="SemiBold"
+                                           LineHeight="28" />
                             </StackPanel>
                             <StackPanel Grid.Column="1"
                                         Spacing="2"
@@ -46,8 +47,9 @@
                                            Opacity="0.65"
                                            HorizontalAlignment="Right" />
                                 <TextBlock Text="{Binding DiskUsageText}"
-                                           FontSize="18"
+                                           FontSize="16"
                                            FontWeight="SemiBold"
+                                           LineHeight="22"
                                            HorizontalAlignment="Right" />
                             </StackPanel>
                         </Grid>
diff --git a/LanMountainDesktop/Views/SettingsPages/UpdateSettingsPage.axaml b/LanMountainDesktop/Views/SettingsPages/UpdateSettingsPage.axaml
index 270cca0..2256595 100644
--- a/LanMountainDesktop/Views/SettingsPages/UpdateSettingsPage.axaml
+++ b/LanMountainDesktop/Views/SettingsPages/UpdateSettingsPage.axaml
@@ -13,16 +13,24 @@
         <TextBlock Classes="settings-section-description" Text="{Binding PageDescription}" />
       </StackPanel>
 
-        <StackPanel Spacing="16" Margin="0,0,0,24">
-          <Grid ColumnDefinitions="Auto,*,Auto">
-            <ui:FAFontIcon Glyph="&#xF0288;" FontFamily="avares://fluenticons.resources.avalonia/Assets#Seagull Fluent Icons" FontSize="40" VerticalAlignment="Center" Margin="0,0,20,0" Foreground="{DynamicResource AccentFillColorDefaultBrush}" />
-            
-            <StackPanel Grid.Column="1" VerticalAlignment="Center" Spacing="4">
-              <TextBlock Text="{Binding StatusMessage}" FontSize="24" FontWeight="Medium" TextWrapping="Wrap" />
-              <TextBlock Text="{Binding LastCheckedText}" Classes="settings-item-description" />
+        <StackPanel Spacing="12" Margin="0,0,0,20">
+          <Grid ColumnDefinitions="Auto,*,Auto" ColumnSpacing="0">
+            <ui:FAFontIcon Classes="settings-hero-icon"
+                           Glyph="&#xF0288;"
+                           FontFamily="avares://fluenticons.resources.avalonia/Assets#Seagull Fluent Icons" />
+
+            <StackPanel Grid.Column="1" VerticalAlignment="Center" Spacing="2">
+              <TextBlock Classes="settings-hero-title" Text="{Binding StatusMessage}" />
+              <TextBlock Classes="settings-item-description" Text="{Binding LastCheckedText}" />
             </StackPanel>
 
-            <Button Grid.Column="2" Classes="settings-accent-button" Content="{Binding CheckButtonText}" Command="{Binding CheckCommand}" IsVisible="{Binding CanCheck}" VerticalAlignment="Center" Margin="16,0,0,0" />
+            <Button Grid.Column="2"
+                    Classes="settings-accent-button"
+                    Content="{Binding CheckButtonText}"
+                    Command="{Binding CheckCommand}"
+                    IsVisible="{Binding CanCheck}"
+                    VerticalAlignment="Center"
+                    Margin="12,0,0,0" />
           </Grid>
 
           <StackPanel IsVisible="{Binding IsProgressSectionVisible}" Spacing="12">
@@ -110,37 +118,16 @@
           <StackPanel Spacing="2" Margin="0,16,0,0">
             <TextBlock Classes="settings-section-description" Text="{Binding PreferencesDescription}" Margin="0,0,0,12" />
 
-            <ui:FASettingsExpander Classes="settings-expander-card" Header="{Binding ChannelLabel}" Description="{Binding ChannelDescription}">
+            <ui:FASettingsExpander Classes="settings-expander-card" Header="{Binding SmartUpdateLabel}" Description="{Binding SmartUpdateDescription}">
               <ui:FASettingsExpander.IconSource>
                 <ui:FAFontIconSource Glyph="&#xF0908;" FontFamily="avares://fluenticons.resources.avalonia/Assets#Seagull Fluent Icons" />
               </ui:FASettingsExpander.IconSource>
               <ui:FASettingsExpander.Footer>
-                <ComboBox Width="220" ItemsSource="{Binding ChannelOptions}" SelectedItem="{Binding SelectedChannel}">
-                  <ComboBox.ItemTemplate>
-                    <DataTemplate x:DataType="vm:SelectionOption">
-                      <TextBlock Text="{Binding Label}" />
-                    </DataTemplate>
-                  </ComboBox.ItemTemplate>
-                </ComboBox>
+                <ToggleSwitch IsChecked="{Binding SmartUpdateEnabled}" OnContent="{Binding SmartUpdateOnText}" OffContent="{Binding SmartUpdateOffText}" />
               </ui:FASettingsExpander.Footer>
             </ui:FASettingsExpander>
 
-            <ui:FASettingsExpander Classes="settings-expander-card" Header="{Binding SourceLabel}" Description="{Binding SourceDescription}">
-              <ui:FASettingsExpander.IconSource>
-                <ui:FAFontIconSource Glyph="&#xF0168;" FontFamily="avares://fluenticons.resources.avalonia/Assets#Seagull Fluent Icons" />
-              </ui:FASettingsExpander.IconSource>
-              <ui:FASettingsExpander.Footer>
-                <ComboBox Width="220" ItemsSource="{Binding SourceOptions}" SelectedItem="{Binding SelectedSource}">
-                  <ComboBox.ItemTemplate>
-                    <DataTemplate x:DataType="vm:SelectionOption">
-                      <TextBlock Text="{Binding Label}" />
-                    </DataTemplate>
-                  </ComboBox.ItemTemplate>
-                </ComboBox>
-              </ui:FASettingsExpander.Footer>
-            </ui:FASettingsExpander>
-
-            <ui:FASettingsExpander Classes="settings-expander-card" Header="{Binding ModeLabel}" Description="{Binding ModeDescription}">
+            <ui:FASettingsExpander Classes="settings-expander-card" Header="{Binding ModeLabel}" Description="{Binding ModeDescription}" IsVisible="{Binding SmartUpdateEnabled}">
               <ui:FASettingsExpander.IconSource>
                 <ui:FAFontIconSource Glyph="&#xF08E8;" FontFamily="avares://fluenticons.resources.avalonia/Assets#Seagull Fluent Icons" />
               </ui:FASettingsExpander.IconSource>
diff --git a/LanMountainDesktop/Views/SettingsPages/WeatherSettingsPage.axaml b/LanMountainDesktop/Views/SettingsPages/WeatherSettingsPage.axaml
index c60d39f..06df599 100644
--- a/LanMountainDesktop/Views/SettingsPages/WeatherSettingsPage.axaml
+++ b/LanMountainDesktop/Views/SettingsPages/WeatherSettingsPage.axaml
@@ -128,7 +128,9 @@
                                                       ColumnSpacing="10">
                                                     <ui:FAFontIcon Glyph="&#xF04E8;"
                                                                    FontFamily="avares://fluenticons.resources.avalonia/Assets#Seagull Fluent Icons"
-                                                                   FontSize="18"
+                                                                   FontSize="16"
+                                                                   Width="16"
+                                                                   Height="16"
                                                                    VerticalAlignment="Center" />
                                                     <StackPanel Grid.Column="1"
                                                                 Spacing="2">
diff --git a/docs/00-快速开始/01-项目介绍.md b/docs/00-快速开始/01-项目介绍.md
index a0b4b8e..64aece2 100644
--- a/docs/00-快速开始/01-项目介绍.md
+++ b/docs/00-快速开始/01-项目介绍.md
@@ -45,7 +45,7 @@
 | Avalonia UI | 12.x | 跨平台 UI 框架 |
 | FluentAvalonia | 2.x | Fluent Design 控件 |
 | CommunityToolkit.Mvvm | 8.x | MVVM 框架 |
-| VeloPack | 最新 | 应用更新系统 |
+| PLONDS | 自研 | 应用增量更新与分发系统 |
 | dotnetCampus.Ipc | 最新 | 进程间通信 |
 
 ### 项目结构
diff --git a/docs/05-更新与发布/01-更新系统架构.md b/docs/05-更新与发布/01-更新系统架构.md
index b4976f2..f812780 100644
--- a/docs/05-更新与发布/01-更新系统架构.md
+++ b/docs/05-更新与发布/01-更新系统架构.md
@@ -162,10 +162,9 @@
 ```
 LanMountainDesktop-v1.0.2/
 ├── LanMountainDesktop-Setup-1.0.2-x64.exe      # 完整安装包
-├── releases.win.json                            # VeloPack 清单
-├── LanMountainDesktop-1.0.2-win-x64.nupkg      # VeloPack 包
-├── RELEASES                                     # VeloPack 元数据
-└── (legacy) plonds-filemap-1.0.2.json          # 旧格式（可选）
+├── plonds-filemap-1.0.2.json                   # PLONDS 增量清单
+├── plonds-filemap-1.0.2.sig                    # RSA 签名
+└── objects/                                    # 增量对象文件（或归档）
 ```
 
 #### plonds-filemap.json 格式
@@ -451,21 +450,12 @@ private static void EnsurePathWithinRoot(
 
 切换后立即检查更新。
 
-## VeloPack 集成
+## 职责边界（当前设计）
 
-### 当前状态
-
-- ✅ CI 管道已生成 VeloPack 原生资产（`releases.win.json`, `*.nupkg`, `RELEASES`）
-- ✅ Host 拥有更新检查/下载/应用/回滚编排
-- ✅ Launcher 仅负责版本选择和启动
-- ⚠️ 旧的 `files.json` + `update.zip` 生成作为禁用的回退路径保留在 CI 中
-
-### 未来迁移
-
-计划完全迁移到 VeloPack：
-1. 移除旧格式支持
-2. 简化 CI 管道
-3. 利用 VeloPack 的增量更新算法
+- ✅ Host 拥有更新检查 / 下载 / 应用 / 回滚编排（`UpdateOrchestrator` + PLONDS）
+- ✅ Launcher 仅负责版本选择、启动协调、清理 `.destroy` / `.partial`
+- ❌ Launcher 不再执行 `apply-update` / `rollback`，也不再托管更新进度窗口业务
+- ❌ 已移除 VeloPack / 启动器侧更新引擎残留
 
 ## 相关文档
 
diff --git a/docs/README.md b/docs/README.md
index dbb1baa..174d144 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -74,7 +74,7 @@ Air APP 独立应用开发指南
 - **Avalonia UI 12** - 跨平台 UI 框架
 - **FluentAvalonia** - Fluent Design 控件库
 - **CommunityToolkit.Mvvm** - MVVM 框架
-- **VeloPack** - 应用更新系统
+- **PLONDS** - 应用增量更新与分发系统
 - **dotnetCampus.Ipc** - 进程间通信
 
 ## 📖 相关资源