Revert "Update MainWindow.xaml.cs"

This reverts commit 298164d6ed.

Ink Canvas/MainWindow.xaml.cs

@@ -832,6 +832,8 @@ namespace Ink_Canvas
             // 声明下载状态变量，用于整个方法
             bool isDownloadSuccessful = false;
 
+            bool hasValidLineGroup = lineGroup != null;
+
             if (AvailableLatestVersion != null)
             {
                 // 检测到新版本，停止重试定时器
@@ -1001,6 +1003,14 @@ namespace Ink_Canvas
                         break;
                 }
             }
+            else if (hasValidLineGroup)
+            {
+                LogHelper.WriteLogToFile("AutoUpdate | Current version is already the latest, no retry needed");
+
+                // 停止重试定时器
+                timerCheckAutoUpdateRetry.Stop();
+                updateCheckRetryCount = 0;
+            }
             else
             {
                 // 检查更新失败，启动重试定时器
@@ -1017,7 +1027,7 @@ namespace Ink_Canvas
             }
         }
 
-        // 崩溃后操作设置按钮事件
+        // 新增：崩溃后操作设置按钮事件
         private void RadioCrashAction_Checked(object sender, RoutedEventArgs e)
         {
             if (RadioCrashSilentRestart != null && RadioCrashSilentRestart.IsChecked == true)