diff --git a/installer/MauiProgram.cs b/installer/MauiProgram.cs
index 357d6942..f29d0d2e 100755
--- a/installer/MauiProgram.cs
+++ b/installer/MauiProgram.cs
@@ -1,31 +1,69 @@
 using Microsoft.Extensions.Logging;
+using System.Reflection;
+using CommunityToolkit.Maui;
+using CommunityToolkit.Maui.Core;
+using CommunityToolkit.Maui.Storage;
+using installer.ViewModel;
+using System.Runtime.CompilerServices;
+using installer.Model;
 
 namespace installer
 {
     public static class MauiProgram
     {
-        public static Model.Downloader Downloader = new Model.Downloader();
+        // public static Model.Logger logger = Model.LoggerProvider.FromFile(@"E:\bin\log\123.log");
         public static bool ErrorTrigger_WhileDebug = true;
         public static bool RefreshLogs_WhileDebug = false;
+        public static string SecretID = "***";
+        public static string SecretKey = "***";
         public static MauiApp CreateMauiApp()
         {
             var builder = MauiApp.CreateBuilder();
             builder
                 .UseMauiApp<App>()
+                .UseMauiCommunityToolkitCore()
+                .UseMauiCommunityToolkit()
                 .ConfigureFonts(fonts =>
                 {
                     fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
                     fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
                 });
 
-            // 此处填写Secret ID和Secret Key
-            Downloader.Cloud.UpdateSecret("***", "***");
+            var c = builder.Services.AddSingleton<Downloader>().First();
 
+            builder.Services.AddSingleton(FolderPicker.Default);
+
+
+            AddViewModelService(builder);
+            AddPageService(builder);
 #if DEBUG
             builder.Logging.AddDebug();
 #endif
 
             return builder.Build();
         }
+
+        public static void AddViewModelService(MauiAppBuilder builder)
+        {
+            var a = typeof(MauiProgram).Assembly;
+            foreach (var t in a.GetTypes())
+            {
+                if ((t.FullName ?? string.Empty).StartsWith($"{a.GetName().Name}.ViewModel") && !t.IsAbstract)
+                {
+                    builder.Services.AddSingleton(t);
+                }
+            }
+        }
+        public static void AddPageService(MauiAppBuilder builder)
+        {
+            var a = typeof(MauiProgram).Assembly;
+            foreach (var t in a.GetTypes())
+            {
+                if ((t.FullName ?? string.Empty).StartsWith($"{a.GetName().Name}.Page") && !t.IsAbstract)
+                {
+                    builder.Services.AddSingleton(t);
+                }
+            }
+        }
     }
 }
\ No newline at end of file
diff --git a/installer/Model/Downloader.cs b/installer/Model/Downloader.cs
index 3bc0dc1b..1ffd3ee2 100755
--- a/installer/Model/Downloader.cs
+++ b/installer/Model/Downloader.cs
@@ -128,6 +128,7 @@ public Downloader()
                         Password = temp;
                 }
             }
+            Cloud.UpdateSecret(MauiProgram.SecretID, MauiProgram.SecretKey);
         }
 
         public void LoggerBinding()
diff --git a/installer/Model/Local_Data.cs b/installer/Model/Local_Data.cs
index 34d076ea..2b3d147a 100755
--- a/installer/Model/Local_Data.cs
+++ b/installer/Model/Local_Data.cs
@@ -25,10 +25,10 @@ public Dictionary<string, string> Config
         {
             get; protected set;
         } = new Dictionary<string, string>();
-        public Dictionary<string, string> MD5Data
+        public ConcurrentDictionary<string, string> MD5Data
         {
             get; protected set;
-        } = new Dictionary<string, string>();   // 路径为尽可能相对路径
+        } = new ConcurrentDictionary<string, string>();   // 路径为尽可能相对路径
         public ConcurrentBag<(DataRowState state, string name)> MD5Update
         {
             get; set;
@@ -249,7 +249,7 @@ public void ReadMD5Data()
                 }
                 else
                 {
-                    newMD5Data = JsonSerializer.Deserialize<Dictionary<string, string>>(json);
+                    newMD5Data = JsonSerializer.Deserialize<Dictionary<string, string>>(json) ?? new Dictionary<string, string>();
                 }
                 r.Close(); r.Dispose();
             }
@@ -270,19 +270,16 @@ public void ReadMD5Data()
             foreach (var item in newMD5Data)
             {
                 var key = item.Key.Replace('/', Path.DirectorySeparatorChar);
-                if (MD5Data.ContainsKey(key))
+                MD5Data.AddOrUpdate(key, (k) =>
                 {
-                    if (MD5Data[key] != item.Value)
-                    {
-                        MD5Data[key] = item.Value;
-                        MD5Update.Add((DataRowState.Modified, key));
-                    }
-                }
-                else
-                {
-                    MD5Data.Add(key, item.Value);
                     MD5Update.Add((DataRowState.Added, key));
-                }
+                    return item.Value;
+                }, (k, v) =>
+                {
+                    if (v != item.Value)
+                        MD5Update.Add((DataRowState.Modified, key));
+                    return item.Value;
+                });
             }
         }
 
@@ -314,41 +311,54 @@ public void ScanDir()
                     continue;
                 var file = _file.StartsWith('.') ?
                     Path.Combine(InstallPath, _file) : _file;
-                if (!File.Exists(file))
+                if (!File.Exists(file) && MD5Data.TryRemove(_file, out _))
                 {
-                    MD5Data.Remove(_file);
                     MD5Update.Add((DataRowState.Deleted, _file));
                 }
             }
-            ScanDir(InstallPath);
-            SaveMD5Data();
-        }
-
-        public void ScanDir(string dir)
-        {
-            var d = new DirectoryInfo(dir);
-            foreach (var file in d.GetFiles())
+            // 层序遍历文件树
+            Stack<string> stack = new Stack<string>();
+            List<string> files = new List<string>();
+            stack.Push(InstallPath);
+            while (stack.Count > 0)
             {
-                var relFile = Helper.ConvertAbsToRel(InstallPath, file.FullName);
-                // 用户自己的文件不会被计入更新hash数据中
-                if (IsUserFile(relFile))
-                    continue;
-                var hash = Helper.GetFileMd5Hash(file.FullName);
-                if (MD5Data.Keys.Contains(relFile))
+                string cur = stack.Pop();
+                files.AddRange(from f in Directory.GetFiles(cur)
+                               where !IsUserFile(f)
+                               select f);
+                foreach (var d in Directory.GetDirectories(cur))
+                    stack.Push(d);
+            }
+            if (files.Count == 0)
+            {
+                MD5Data.Clear();
+                SaveMD5Data();
+                return;
+            }
+            // 并行计算hash值
+            var partitioner = Partitioner.Create(0, files.Count);
+            Parallel.ForEach(partitioner, (range, loopState) =>
+            {
+                for (int i = range.Item1; i < range.Item2; i++)
                 {
-                    if (MD5Data[relFile] != hash)
+                    if (loopState.IsStopped)
+                        break;
+                    var file = files[i];
+                    var relFile = Helper.ConvertAbsToRel(InstallPath, file);
+                    var hash = Helper.GetFileMd5Hash(file);
+                    MD5Data.AddOrUpdate(relFile, (k) =>
                     {
-                        MD5Data[relFile] = hash;
-                        MD5Update.Add((DataRowState.Modified, relFile));
-                    }
-                }
-                else
-                {
-                    MD5Data.Add(relFile, hash);
-                    MD5Update.Add((DataRowState.Added, relFile));
+                        MD5Update.Add((DataRowState.Added, relFile));
+                        return hash;
+                    }, (k, v) =>
+                    {
+                        if (v != hash)
+                            MD5Update.Add((DataRowState.Modified, relFile));
+                        return hash;
+                    });
                 }
-            }
-            foreach (var d1 in d.GetDirectories()) { ScanDir(d1.FullName); }
+            });
+            SaveMD5Data();
         }
     }
 }
diff --git a/installer/Model/Tencent_Cos.cs b/installer/Model/Tencent_Cos.cs
index ee210b50..32c506e2 100755
--- a/installer/Model/Tencent_Cos.cs
+++ b/installer/Model/Tencent_Cos.cs
@@ -7,6 +7,7 @@
 using System.Formats.Tar;
 using COSXML.Common;
 using COSXML.Transfer;
+using System;
 
 // 禁用对没有调用异步API的异步函数的警告
 #pragma warning disable CS1998
@@ -38,6 +39,8 @@ public Tencent_Cos(string appid, string region, string bucketName, Logger? _log
                         .SetRegion(Region)  // 设置一个默认的存储桶地域
                         .SetDebugLog(true)  // 显示日志
                         .Build();           // 创建 CosXmlConfig 对象
+            QCloudCredentialProvider cosCredentialProvider = new DefaultQCloudCredentialProvider("***", "***", 1000);
+            cosXml = new CosXmlServer(config, cosCredentialProvider);
         }
 
         public void UpdateSecret(string secretId, string secretKey, long durationSecond = 1000)
@@ -93,30 +96,34 @@ public async Task<int> DownloadQueueAsync(string basePath, IEnumerable<string> q
         {
             int thID = Log.StartNew();
             Log.LogInfo(thID, "Batch download task started.");
-            int count = queue.Count();
+            var array = queue.ToArray();
+            int count = array.Count();
             int finished = 0;
-            foreach (var item in queue)
+            var partitionar = Partitioner.Create(0, count);
+            Parallel.ForEach(partitionar, (range, loopState) =>
             {
-                string local = Path.Combine(basePath, item);
-                int subID = -1;
-                ThreadPool.QueueUserWorkItem(_ =>
+                for (int i = range.Item1; i < range.Item2; i++)
                 {
+                    if (!loopState.IsStopped)
+                        break;
+                    string local = Path.Combine(basePath, array[i]);
+                    int subID = -1;
                     try
                     {
-                        subID = DownloadFileAsync(local, item).Result;
+                        subID = DownloadFileAsync(local, array[i]).Result;
                     }
                     catch (Exception ex)
                     {
-                        downloadFailed.Enqueue(item);
+                        downloadFailed.Enqueue(array[i]);
+                        Exceptions.Push(ex);
                     }
                     finally
                     {
                         Interlocked.Increment(ref finished);
                         Log.LogInfo(thID, $"Child process: {subID} finished.");
                     }
-                });
-            }
-            while (finished < count) ;
+                }
+            });
             Log.LogInfo(thID, "Batch download task finished.");
             return thID;
         }
diff --git a/installer/Page/InstallPage.xaml b/installer/Page/InstallPage.xaml
index 984f9896..da9a5d81 100644
--- a/installer/Page/InstallPage.xaml
+++ b/installer/Page/InstallPage.xaml
@@ -4,9 +4,6 @@
              xmlns:viewModels="clr-namespace:installer.ViewModel"
              x:Class="installer.Page.InstallPage"
              Title="Installer">
-    <ContentPage.BindingContext>
-        <viewModels:InstallViewModel/>
-    </ContentPage.BindingContext>
 
     <VerticalStackLayout
         HorizontalOptions="Center"
diff --git a/installer/Page/InstallPage.xaml.cs b/installer/Page/InstallPage.xaml.cs
index e87b6401..365a3311 100644
--- a/installer/Page/InstallPage.xaml.cs
+++ b/installer/Page/InstallPage.xaml.cs
@@ -1,9 +1,13 @@
+using CommunityToolkit.Maui.Storage;
+using installer.ViewModel;
+
 namespace installer.Page;
 
 public partial class InstallPage : ContentPage
 {
-    public InstallPage()
+    public InstallPage(InstallViewModel viewModel)
     {
         InitializeComponent();
+        BindingContext = viewModel;
     }
 }
\ No newline at end of file
diff --git a/installer/Page/LaunchPage.xaml b/installer/Page/LaunchPage.xaml
index 257f404a..8621e4f4 100644
--- a/installer/Page/LaunchPage.xaml
+++ b/installer/Page/LaunchPage.xaml
@@ -4,9 +4,6 @@
              xmlns:viewModels="clr-namespace:installer.ViewModel"
              x:Class="installer.Page.LaunchPage"
              Title="Launcher">
-    <ContentPage.BindingContext>
-        <viewModels:LaunchViewModel/>
-    </ContentPage.BindingContext>
     
     <VerticalStackLayout>
         <Label
diff --git a/installer/Page/LaunchPage.xaml.cs b/installer/Page/LaunchPage.xaml.cs
index 3239a9ff..69ed6151 100644
--- a/installer/Page/LaunchPage.xaml.cs
+++ b/installer/Page/LaunchPage.xaml.cs
@@ -1,9 +1,12 @@
+using installer.ViewModel;
+
 namespace installer.Page;
 
 public partial class LaunchPage : ContentPage
 {
-    public LaunchPage()
+    public LaunchPage(LaunchViewModel viewModel)
     {
         InitializeComponent();
+        BindingContext = viewModel;
     }
 }
\ No newline at end of file
diff --git a/installer/Page/LoginPage.xaml b/installer/Page/LoginPage.xaml
index c08c5019..72b25511 100755
--- a/installer/Page/LoginPage.xaml
+++ b/installer/Page/LoginPage.xaml
@@ -4,9 +4,6 @@
              xmlns:viewModels="clr-namespace:installer.ViewModel"
              x:Class="installer.Page.LoginPage"
              Title="Login">
-    <ContentPage.BindingContext>
-        <viewModels:LoginViewModel/>
-    </ContentPage.BindingContext>
 
     <VerticalStackLayout
         HorizontalOptions="Center"
diff --git a/installer/Page/LoginPage.xaml.cs b/installer/Page/LoginPage.xaml.cs
index e61420f7..721f4fe6 100755
--- a/installer/Page/LoginPage.xaml.cs
+++ b/installer/Page/LoginPage.xaml.cs
@@ -1,9 +1,12 @@
+using installer.ViewModel;
+
 namespace installer.Page;
 
 public partial class LoginPage : ContentPage
 {
-    public LoginPage()
+    public LoginPage(LoginViewModel viewModel)
     {
         InitializeComponent();
+        BindingContext = viewModel;
     }
 }
\ No newline at end of file
diff --git a/installer/Platforms/Android/AndroidManifest.xml b/installer/Platforms/Android/AndroidManifest.xml
index e9937ad7..3e7be080 100755
--- a/installer/Platforms/Android/AndroidManifest.xml
+++ b/installer/Platforms/Android/AndroidManifest.xml
@@ -1,6 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
-	<application android:allowBackup="true" android:icon="@mipmap/appicon" android:roundIcon="@mipmap/appicon_round" android:supportsRtl="true"></application>
+	<application android:allowBackup="true" android:icon="@mipmap/appicon" android:supportsRtl="true"></application>
 	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 	<uses-permission android:name="android.permission.INTERNET" />
+	<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+	<uses-sdk />
 </manifest>
\ No newline at end of file
diff --git a/installer/Platforms/MacCatalyst/Entitlements.plist b/installer/Platforms/MacCatalyst/Entitlements.plist
index de4adc94..344afde3 100755
--- a/installer/Platforms/MacCatalyst/Entitlements.plist
+++ b/installer/Platforms/MacCatalyst/Entitlements.plist
@@ -9,6 +9,8 @@
         <!-- When App Sandbox is enabled, this value is required to open outgoing network connections. -->
         <key>com.apple.security.network.client</key>
         <true/>
+        <key>com.apple.security.files.user-selected.read-write</key>
+        <true/>
     </dict>
 </plist>
 
diff --git a/installer/ViewModel/InstallViewModel.cs b/installer/ViewModel/InstallViewModel.cs
index 3f4e2a0c..52307612 100644
--- a/installer/ViewModel/InstallViewModel.cs
+++ b/installer/ViewModel/InstallViewModel.cs
@@ -1,27 +1,29 @@
 using CommunityToolkit.Mvvm.Input;
+using CommunityToolkit.Maui;
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Input;
+using CommunityToolkit.Maui.Storage;
 
 namespace installer.ViewModel
 {
-    internal class InstallViewModel : BaseViewModel
+    public class InstallViewModel : BaseViewModel
     {
-        public InstallViewModel()
+        private readonly Model.Downloader Downloader;
+        private readonly IFolderPicker FolderPicker;
+
+        public InstallViewModel(IFolderPicker folderPicker, Model.Downloader downloader)
         {
+            Downloader = downloader;
+            FolderPicker = folderPicker;
             downloadPath = Downloader.Data.InstallPath;
             installEnabled = false;
-            BrowseBtnClickedCommand = new RelayCommand(BrowseBtnClicked);
+            BrowseBtnClickedCommand = new AsyncRelayCommand(BrowseBtnClicked);
             CheckUpdBtnClickedCommand = new RelayCommand(CheckUpdBtnClicked);
-            DownloadBtnClickedCommand = new RelayCommand(DownloadBtnClicked);
-        }
-
-        public Model.Downloader Downloader
-        {
-            get => MauiProgram.Downloader;
+            DownloadBtnClickedCommand = new AsyncRelayCommand(DownloadBtnClicked);
         }
 
         private string? debugAlert;
@@ -41,15 +43,26 @@ public string DownloadPath
             set
             {
                 downloadPath = value;
-                InstallEnabled = (value != Downloader.Data.InstallPath);
+                InstallEnabled = (value != Downloader.Data.InstallPath && Directory.Exists(value));
                 OnPropertyChanged();
             }
         }
 
         public ICommand BrowseBtnClickedCommand { get; }
-        private void BrowseBtnClicked()
+        private async Task BrowseBtnClicked()
         {
             DebugAlert = "Browse Button Clicked";
+            var b = InstallEnabled;
+            InstallEnabled = false;
+            var result = await FolderPicker.PickAsync(downloadPath);
+            if (result.IsSuccessful)
+            {
+                DownloadPath = result.Folder.Path;
+            }
+            else
+            {
+                InstallEnabled = b;
+            }
         }
         public ICommand CheckUpdBtnClickedCommand { get; }
         private async void CheckUpdBtnClicked()
@@ -58,20 +71,24 @@ private async void CheckUpdBtnClicked()
             bool updated = await Task.Run(() => Downloader.CheckUpdate());
             if (updated)
             {
-
+                DebugAlert = "Need to update.";
             }
             else
             {
-
+                DebugAlert = "Nothing to update.";
             }
         }
         public ICommand DownloadBtnClickedCommand { get; }
-        private async void DownloadBtnClicked()
+        private async Task DownloadBtnClicked()
         {
+            if (!InstallEnabled)
+                return;
+            InstallEnabled = false;
             DebugAlert = "Download Button Clicked";
             await Task.Run(() => Downloader.ResetInstallPath(downloadPath));
             await Task.Run(() => Downloader.Install());
             DownloadPath = Downloader.Data.InstallPath;
+            InstallEnabled = true;
         }
 
         private bool installEnabled;
diff --git a/installer/ViewModel/LaunchViewModel.cs b/installer/ViewModel/LaunchViewModel.cs
index eb95afa8..ae95ea06 100644
--- a/installer/ViewModel/LaunchViewModel.cs
+++ b/installer/ViewModel/LaunchViewModel.cs
@@ -8,7 +8,7 @@
 
 namespace installer.ViewModel
 {
-    internal class LaunchViewModel : BaseViewModel
+    public class LaunchViewModel : BaseViewModel
     {
 
     }
diff --git a/installer/ViewModel/LoginViewModel.cs b/installer/ViewModel/LoginViewModel.cs
index 4a67575d..66b49ade 100755
--- a/installer/ViewModel/LoginViewModel.cs
+++ b/installer/ViewModel/LoginViewModel.cs
@@ -8,17 +8,16 @@
 
 namespace installer.ViewModel
 {
-    internal class LoginViewModel : BaseViewModel
+    public class LoginViewModel : BaseViewModel
     {
-        public LoginViewModel()
+        private readonly Model.Downloader Downloader;
+
+        public LoginViewModel(Model.Downloader downloader)
         {
+            Downloader = downloader;
             LoginBtnClickedCommand = new RelayCommand(LoginBtnClicked);
         }
 
-        Model.Downloader Downloader
-        {
-            get => MauiProgram.Downloader;
-        }
         public string Username
         {
             get => Downloader.Username;
diff --git a/installer/installer.csproj b/installer/installer.csproj
index 57a4ab01..49da694e 100755
--- a/installer/installer.csproj
+++ b/installer/installer.csproj
@@ -31,6 +31,38 @@
 		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'tizen'">6.5</SupportedOSPlatformVersion>
 	</PropertyGroup>
 
+	<PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|net8.0-android|AnyCPU'">
+	  <ApplicationDisplayVersion>1.0.0</ApplicationDisplayVersion>
+	</PropertyGroup>
+
+	<PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|net8.0-ios|AnyCPU'">
+	  <ApplicationDisplayVersion>1.0.0</ApplicationDisplayVersion>
+	</PropertyGroup>
+
+	<PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|net8.0-maccatalyst|AnyCPU'">
+	  <ApplicationDisplayVersion>1.0.0</ApplicationDisplayVersion>
+	</PropertyGroup>
+
+	<PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Debug|net8.0-windows10.0.19041.0|AnyCPU'">
+	  <ApplicationDisplayVersion>1.0.0</ApplicationDisplayVersion>
+	</PropertyGroup>
+
+	<PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|net8.0-android|AnyCPU'">
+	  <ApplicationDisplayVersion>1.0.0</ApplicationDisplayVersion>
+	</PropertyGroup>
+
+	<PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|net8.0-ios|AnyCPU'">
+	  <ApplicationDisplayVersion>1.0.0</ApplicationDisplayVersion>
+	</PropertyGroup>
+
+	<PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|net8.0-maccatalyst|AnyCPU'">
+	  <ApplicationDisplayVersion>1.0.0</ApplicationDisplayVersion>
+	</PropertyGroup>
+
+	<PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|net8.0-windows10.0.19041.0|AnyCPU'">
+	  <ApplicationDisplayVersion>1.0.0</ApplicationDisplayVersion>
+	</PropertyGroup>
+
 	<ItemGroup>
 		<!-- App Icon -->
 		<MauiIcon Include="Resources\AppIcon\appicon.svg" ForegroundFile="Resources\AppIcon\appiconfg.svg" Color="#512BD4" />
@@ -50,6 +82,8 @@
 	</ItemGroup>
 
 	<ItemGroup>
+		<PackageReference Include="CommunityToolkit.Maui" Version="7.0.1" />
+		<PackageReference Include="CommunityToolkit.Maui.Core" Version="7.0.1" />
 		<PackageReference Include="CommunityToolkit.Mvvm" Version="8.2.2" />
 		<PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="8.0.0" />
 		<PackageReference Include="Tencent.QCloud.Cos.Sdk" Version="5.4.36" />