diff --git a/src/Models/ConfigGeneratorModel.cs b/src/Models/ConfigGeneratorModel.cs
index e66c630..0587431 100644
--- a/src/Models/ConfigGeneratorModel.cs
+++ b/src/Models/ConfigGeneratorModel.cs
@@ -15,9 +15,9 @@ public partial class ConfigGeneratorModel : ObservableObject
 
     // ── Editable fields (auto-filled + user input) ──
     [ObservableProperty] private string _mainAppName = "";
-    [ObservableProperty] private string _clientVersion = "1.0.0";
+    [ObservableProperty] private string _clientVersion = "0.0.1";
     [ObservableProperty] private string _updateAppName = "Update.exe";
-    [ObservableProperty] private string _upgradeClientVersion = "1.0.0";
+    [ObservableProperty] private string _upgradeClientVersion = "0.0.1";
     [ObservableProperty] private string _appType = "Client";
     [ObservableProperty] private string _productId = "";
     [ObservableProperty] private string _updatePath = "update/";
diff --git a/src/Models/ExtensionConfigModel.cs b/src/Models/ExtensionConfigModel.cs
index 0c3ec47..16f8213 100644
--- a/src/Models/ExtensionConfigModel.cs
+++ b/src/Models/ExtensionConfigModel.cs
@@ -5,7 +5,7 @@ namespace GeneralUpdate.Tools.Models;
 public partial class ExtensionConfigModel : ObservableObject
 {
     [ObservableProperty] private string _name = "";
-    [ObservableProperty] private string _version = "1.0.0";
+    [ObservableProperty] private string _version = "0.0.1";
     [ObservableProperty] private string _description = "";
     [ObservableProperty] private string _extensionDirectory = "";
     [ObservableProperty] private string _exportPath = "";
diff --git a/src/Models/ManifestModel.cs b/src/Models/ManifestModel.cs
index 4f2fd73..6887f7a 100644
--- a/src/Models/ManifestModel.cs
+++ b/src/Models/ManifestModel.cs
@@ -3,10 +3,10 @@ namespace GeneralUpdate.Tools.Models;
 public class ManifestModel
 {
     public string MainAppName { get; set; } = "";
-    public string ClientVersion { get; set; } = "1.0.0";
+    public string ClientVersion { get; set; } = "0.0.1";
     public string AppType { get; set; } = "Client";
     public string UpdateAppName { get; set; } = "Update.exe";
-    public string UpgradeClientVersion { get; set; } = "1.0.0";
+    public string UpgradeClientVersion { get; set; } = "0.0.1";
     public string ProductId { get; set; } = "";
     public string UpdatePath { get; set; } = "update/";
 }
diff --git a/src/Models/OSSConfigModel.cs b/src/Models/OSSConfigModel.cs
index d09ac7d..8c7b50c 100644
--- a/src/Models/OSSConfigModel.cs
+++ b/src/Models/OSSConfigModel.cs
@@ -6,7 +6,7 @@ public partial class OSSConfigModel : ObservableObject
 {
     [ObservableProperty] private string _packetName = "Packet";
     [ObservableProperty] private string _hash = "";
-    [ObservableProperty] private string _version = "1.0.0";
+    [ObservableProperty] private string _version = "0.0.1";
     [ObservableProperty] private string _url = "http://127.0.0.1";
     [ObservableProperty] private string _releaseDate = "";
 }
diff --git a/src/Models/PatchConfigModel.cs b/src/Models/PatchConfigModel.cs
index 83f7e35..81b6107 100644
--- a/src/Models/PatchConfigModel.cs
+++ b/src/Models/PatchConfigModel.cs
@@ -7,7 +7,7 @@ public partial class PatchConfigModel : ObservableObject
     [ObservableProperty] private string _oldDirectory = "";
     [ObservableProperty] private string _newDirectory = "";
     [ObservableProperty] private string _packageName = "";
-    [ObservableProperty] private string _version = "1.0.0";
+    [ObservableProperty] private string _version = "0.0.1";
     [ObservableProperty] private string _format = ".zip";
     [ObservableProperty] private string _outputPath = "";
     [ObservableProperty] private bool _enableEncryptionCheck = true;
diff --git a/src/Models/SimulateConfigModel.cs b/src/Models/SimulateConfigModel.cs
index 2c2bd8e..8123118 100644
--- a/src/Models/SimulateConfigModel.cs
+++ b/src/Models/SimulateConfigModel.cs
@@ -9,7 +9,7 @@ public partial class SimulateConfigModel : ObservableObject
 {
     [ObservableProperty] private string _appDirectory = string.Empty;
     [ObservableProperty] private string _patchFilePath = string.Empty;
-    [ObservableProperty] private string _currentVersion = "1.0.0";
+    [ObservableProperty] private string _currentVersion = "0.0.1";
     [ObservableProperty] private string _targetVersion = "2.0.0";
     [ObservableProperty] private int _platform = 1;
     [ObservableProperty] private int _appType = 1;
diff --git a/src/Services/ManifestGeneratorService.cs b/src/Services/ManifestGeneratorService.cs
index bbb883c..c93448d 100644
--- a/src/Services/ManifestGeneratorService.cs
+++ b/src/Services/ManifestGeneratorService.cs
@@ -34,14 +34,14 @@ public static ManifestModel FromCsprojInfo(CsprojInfo client, CsprojInfo? upgrad
             MainAppName = !string.IsNullOrWhiteSpace(userInput?.MainAppName)
                 ? userInput.MainAppName
                 : client.AssemblyName,
-            ClientVersion = userInput?.ClientVersion ?? "1.0.0",
+            ClientVersion = userInput?.ClientVersion ?? "0.0.1",
             AppType = !string.IsNullOrWhiteSpace(userInput?.AppType)
                 ? userInput.AppType
                 : "Client",
             UpdateAppName = !string.IsNullOrWhiteSpace(userInput?.UpdateAppName)
                 ? userInput.UpdateAppName
                 : upgrade?.AssemblyName ?? "Update.exe",
-            UpgradeClientVersion = userInput?.UpgradeClientVersion ?? "1.0.0",
+            UpgradeClientVersion = userInput?.UpgradeClientVersion ?? "0.0.1",
             ProductId = userInput?.ProductId ?? "",
             UpdatePath = !string.IsNullOrWhiteSpace(userInput?.UpdatePath)
                 ? userInput.UpdatePath
diff --git a/src/Services/SimulationService.cs b/src/Services/SimulationService.cs
index fe6a244..d838097 100644
--- a/src/Services/SimulationService.cs
+++ b/src/Services/SimulationService.cs
@@ -73,7 +73,7 @@ public async Task<SimulationResult> RunAsync(
                 ClientVersion = config.CurrentVersion,
                 AppType = config.AppType switch { 1 => "Client", 2 => "Upgrade", _ => "Client" },
                 UpdateAppName = upgradeExeName,
-                UpgradeClientVersion = "1.0.0",
+                UpgradeClientVersion = "0.0.1",
                 ProductId = config.ProductId,
                 UpdatePath = config.UpdatePath ?? "update/"
             };
diff --git a/src/app.manifest b/src/app.manifest
index cde83fd..89f06d3 100644
--- a/src/app.manifest
+++ b/src/app.manifest
@@ -3,7 +3,7 @@
   <!-- This manifest is used on Windows only.
        Don't remove it as it might cause problems with window transparency and embedded controls.
        For more details visit https://learn.microsoft.com/en-us/windows/win32/sbscs/application-manifests -->
-  <assemblyIdentity version="1.0.0.0" name="GeneralUpdate.Tools.V12.Desktop"/>
+  <assemblyIdentity version="0.0.1.0" name="GeneralUpdate.Tools.V12.Desktop"/>
 
   <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
     <application>
diff --git a/test_app/Client/Program.cs b/test_app/Client/Program.cs
index 342fd05..419e8f1 100644
--- a/test_app/Client/Program.cs
+++ b/test_app/Client/Program.cs
@@ -118,5 +118,5 @@ internal class ClientArgs
 {
     public string ServerUrl { get; set; } = "http://127.0.0.1:5000";
     public string AppSecret { get; set; } = "dfeb5833-975e-4afb-88f1-6278ee9aeff6";
-    public string ClientVersion { get; set; } = "1.0.0";
+    public string ClientVersion { get; set; } = "0.0.1";
 }