diff --git a/ModAssistant/Localisation/en.xaml b/ModAssistant/Localisation/en.xaml
index d5a7a1e9..c897bed8 100644
--- a/ModAssistant/Localisation/en.xaml
+++ b/ModAssistant/Localisation/en.xaml
@@ -35,6 +35,10 @@
     <sys:String x:Key="MainWindow:GameUpdateDialog:Line2">Please double check that the correct version is selected at the bottom left corner!</sys:String>
     <sys:String x:Key="MainWindow:NoModSelected">No mod selected!</sys:String>
     <sys:String x:Key="MainWindow:NoModInfoPage">{0} does not have an info page.</sys:String>
+    <sys:String x:Key="MainWindow:GameVersionMismatch" xml:space="preserve">The selected game version {0} is different from detected {1}!
+Do you want to continue?</sys:String>
+    <sys:String x:Key="MainWindow:GameVersionMismatchTitle">Warning: Game Version Mismatch</sys:String>
+
 
     <!-- Intro Page -->
     <sys:String x:Key="Intro:Title">Intro</sys:String>
diff --git a/ModAssistant/Localisation/zh.xaml b/ModAssistant/Localisation/zh.xaml
index 76c13797..faac49a1 100644
--- a/ModAssistant/Localisation/zh.xaml
+++ b/ModAssistant/Localisation/zh.xaml
@@ -38,6 +38,9 @@ OneClick源</sys:String>
     <sys:String x:Key="MainWindow:GameUpdateDialog:Line2">请确保左下角选择的版本与实际版本（地板脚印上有）相同才能安装Mod，否则会破坏你的游戏！</sys:String>
     <sys:String x:Key="MainWindow:NoModSelected">没有选择Mod！</sys:String>
     <sys:String x:Key="MainWindow:NoModInfoPage">{0}没有信息页。</sys:String>
+    <sys:String x:Key="MainWindow:GameVersionMismatch" xml:space="preserve">您选择的游戏版本 {0} 与当前检测到的游戏版本 {1} 不匹配，是否要继续安装Mod？
+警告：继续安装Mod可能会破坏你的游戏，Mod需要匹配游戏版本，否则会出错。</sys:String>
+    <sys:String x:Key="MainWindow:GameVersionMismatchTitle">警告：游戏版本不匹配</sys:String>
 
     <!-- Intro Page -->
     <sys:String x:Key="Intro:Title">简介</sys:String>
@@ -270,7 +273,7 @@ OneClick窗口显示方式切换：</sys:String>
     <sys:String x:Key="OneClick:DoneNotify">OneClick™ 安装完毕</sys:String>
     <sys:String x:Key="OneClick:StartDownloadPlaylist">开始下载歌曲列表</sys:String>
     <sys:String x:Key="OneClick:Done">执行完毕</sys:String>
-    
+
     <!-- Themes Class -->
     <sys:String x:Key="Themes:ThemeNotFound">找不到主题，恢复为默认主题...</sys:String>
     <sys:String x:Key="Themes:ThemeSet">主题设置为{0}.</sys:String>
diff --git a/ModAssistant/MainWindow.xaml.cs b/ModAssistant/MainWindow.xaml.cs
index 05d74f0c..564f0668 100644
--- a/ModAssistant/MainWindow.xaml.cs
+++ b/ModAssistant/MainWindow.xaml.cs
@@ -20,6 +20,7 @@ public partial class MainWindow : Window
         public static bool ModsOpened = false;
         public static bool ModsLoading = false;
         public static string GameVersion;
+        public static string GameVersionDetected;  // the real game version detected from the game
         public static string GameVersionOverride;
         public TaskCompletionSource<bool> VersionLoadStatus = new TaskCompletionSource<bool>();
         public static string[] serverList = { "国际源@BeatMods", "国内源@WGzeyu", "包子源@BeatTop" };
@@ -129,6 +130,7 @@ private async void LoadVersionsAsync()
                 Dictionary<string, string[]> aliases = JsonSerializer.Deserialize<Dictionary<string, string[]>>(body);
 
                 string version = Utils.GetVersion();
+                GameVersionDetected = version;
                 if (!versions.Contains(version) && CheckAliases(versions, aliases, version) == string.Empty)
                 {
                     versions.Insert(0, version);
@@ -281,7 +283,22 @@ private void OptionsButton_Click(object sender, RoutedEventArgs e)
 
         private void InstallButton_Click(object sender, RoutedEventArgs e)
         {
-            Mods.Instance.InstallMods();
+            if (string.IsNullOrEmpty(GameVersionOverride) // game version not listed in aliases at all
+                && GameVersion != GameVersionDetected) // and the user manually selected a version
+            {
+                // show a waring about the version mismatch
+                var result = MessageBox.Show(String.Format((string) Application.Current.FindResource("MainWindow:GameVersionMismatch"), GameVersion, GameVersionDetected),
+                    (string)Application.Current.FindResource("MainWindow:GameVersionMismatchTitle"), MessageBoxButton.OKCancel);
+
+                if (result == MessageBoxResult.OK)
+                {
+                    Mods.Instance.InstallMods();
+                }
+            }
+            else
+            {
+                Mods.Instance.InstallMods();
+            }
         }
 
         private void InfoButton_Click(object sender, RoutedEventArgs e)