diff --git a/Plain Craft Launcher 2/Pages/PageDownload/PageDownloadInstall.xaml b/Plain Craft Launcher 2/Pages/PageDownload/PageDownloadInstall.xaml
index 35c1a4e..5578905 100644
--- a/Plain Craft Launcher 2/Pages/PageDownload/PageDownloadInstall.xaml	
+++ b/Plain Craft Launcher 2/Pages/PageDownload/PageDownloadInstall.xaml	
@@ -27,7 +27,8 @@
                         <local:MyHint Text="必须安装 OptiFabric 才能正常使用 OptiFine！" Margin="0,10,0,0" x:Name="HintOptiFabric" Theme="Red" />
                         <local:MyHint Text="安装结束后，请在 Mod 下载中搜索 OptiFabric Origins 并下载，否则 OptiFine 会无法使用！" Margin="0,10,0,0" x:Name="HintOptiFabricOld" Theme="Yellow" />
                         <local:MyHint Text="OptiFine 与一部分 Mod 的兼容性不佳，请谨慎安装。" Margin="0,10,0,0" x:Name="HintModOptiFine" Theme="Yellow" />
-                        <local:MyCard Title="Forge" Height="40" Margin="0,12,0,0" x:Name="CardForge" IsSwaped="True" CanSwap="True" SwapLogoRight="True">
+						<local:MyHint Text="1.20.5+ 没有 OptiFabric，无法使用 OptiFine，如需加载光影请考虑使用其他 Mod" Margin="0,10,0,0" x:Name="HintModOptiFineHigh" Theme="Blue" />
+						<local:MyCard Title="Forge" Height="40" Margin="0,12,0,0" x:Name="CardForge" IsSwaped="True" CanSwap="True" SwapLogoRight="True">
                         <StackPanel Margin="20,40,18,15" VerticalAlignment="Top" Name="PanForge" />
                         <Grid x:Name="PanForgeInfo" Height="18" Margin="132,11,15,0" VerticalAlignment="Top" Tag="True">
                             <Grid.RenderTransform>
diff --git a/Plain Craft Launcher 2/Pages/PageDownload/PageDownloadInstall.xaml.vb b/Plain Craft Launcher 2/Pages/PageDownload/PageDownloadInstall.xaml.vb
index dfd5042..0e347f7 100644
--- a/Plain Craft Launcher 2/Pages/PageDownload/PageDownloadInstall.xaml.vb	
+++ b/Plain Craft Launcher 2/Pages/PageDownload/PageDownloadInstall.xaml.vb	
@@ -476,6 +476,11 @@
         Else
             HintModOptiFine.Visibility = Visibility.Collapsed
         End If
+        If SelectedFabric IsNot Nothing AndAlso VersionSortInteger(SelectedMinecraftId, "1.21.4") > 0 Then
+            HintModOptiFineHigh.Visibility = Visibility.Visible
+        Else
+            HintModOptiFineHigh.Visibility = Visibility.Collapsed
+        End If
         '结束
         IsReloading = False
     End Sub
@@ -671,6 +676,8 @@
         If SelectedNeoForge IsNot Nothing Then Return "与 NeoForge 不兼容"
         If LoadOptiFine Is Nothing OrElse LoadOptiFine.State.LoadingState = MyLoading.MyLoadingState.Run Then Return "加载中……"
         If LoadOptiFine.State.LoadingState = MyLoading.MyLoadingState.Error Then Return "获取版本列表失败：" & CType(LoadOptiFine.State, Object).Error.Message
+        '检查 Fabric 1.20.5+：没有 OptiFabric 故全部不兼容
+        If SelectedFabric IsNot Nothing AndAlso VersionSortInteger(SelectedMinecraftId, "1.20.4") > 0 Then Return "与 Fabric 不兼容"
         '检查 Forge 1.13 - 1.14.3：全部不兼容
         If SelectedForge IsNot Nothing AndAlso
             VersionSortInteger(SelectedMinecraftId, "1.13") >= 0 AndAlso VersionSortInteger("1.14.3", SelectedMinecraftId) >= 0 Then
@@ -981,6 +988,8 @@
     Private Function LoadFabricGetError() As String
         If LoadFabric Is Nothing OrElse LoadFabric.State.LoadingState = MyLoading.MyLoadingState.Run Then Return "加载中……"
         If LoadFabric.State.LoadingState = MyLoading.MyLoadingState.Error Then Return "获取版本列表失败：" & CType(LoadFabric.State, Object).Error.Message
+        '检查 Fabric 1.20.5+：没有 OptiFabric 故全部不兼容
+        If SelectedOptiFine IsNot Nothing AndAlso VersionSortInteger(SelectedMinecraftId, "1.20.4") > 0 Then Return "与 OptiFine 不兼容"
         For Each Version As JObject In DlFabricListLoader.Output.Value("game")
             If Version("version").ToString = SelectedMinecraftId.Replace("∞", "infinite").Replace("Combat Test 7c", "1.16_combat-3") Then
                 If SelectedForge IsNot Nothing Then Return "与 Forge 不兼容"