diff --git a/README.md b/README.md
index ceaaee4..cd97ba8 100644
--- a/README.md
+++ b/README.md
@@ -36,6 +36,10 @@ The project has been upgraded to `.NET 10`. The main app is packaged as an MSIX
 
 After installation, open Windows Command Palette, then search for and run `Translator`.
 
+> [!IMPORTANT]
+> Install the extension from one channel only (WinGet EXE installer **or** MSIX bundle). Installing both can create duplicate `Translator` entries in Command Palette extension settings.
+> If duplicate entries appear after an update, uninstall both copies, then install only one channel again.
+
 Enter text directly to translate it:
 
 ```text
diff --git a/README.zh-TW.md b/README.zh-TW.md
index 32133ac..f6a9de6 100644
--- a/README.zh-TW.md
+++ b/README.zh-TW.md
@@ -36,6 +36,10 @@
 
 安裝後開啟 Windows Command Palette，搜尋並執行 `Translator`。
 
+> [!IMPORTANT]
+> 請只使用單一來源安裝擴充套件（WinGet EXE 安裝程式 **或** MSIX bundle）。如果兩種都安裝，可能會在 Command Palette 擴充套件設定中出現重複的 `Translator` 項目。
+> 若更新後出現重複項目，請先移除兩份安裝，再重新安裝其中一種來源即可。
+
 直接輸入文字即可翻譯：
 
 ```text
diff --git a/src/CmdPalTranslator/setup-template.iss b/src/CmdPalTranslator/setup-template.iss
index 7f4edd4..f9e342a 100644
--- a/src/CmdPalTranslator/setup-template.iss
+++ b/src/CmdPalTranslator/setup-template.iss
@@ -50,3 +50,6 @@ Name: "{group}\{#AppName}"; Filename: "{app}\{#ExtensionName}.exe"
 [Registry]
 Root: HKCU; Subkey: "SOFTWARE\Classes\CLSID\{#Clsid}"; ValueType: string; ValueName: ""; ValueData: "{#ExtensionName}"; Flags: uninsdeletekey
 Root: HKCU; Subkey: "SOFTWARE\Classes\CLSID\{#Clsid}\LocalServer32"; ValueType: string; ValueName: ""; ValueData: """{app}\{#ExtensionName}.exe"" -RegisterProcessAsComServer"; Flags: uninsdeletekey
+
+[Run]
+Filename: "powershell.exe"; Parameters: "-NoProfile -ExecutionPolicy Bypass -Command ""Get-AppxPackage -Name '25526PoyChang.TranslatorforCommandPalette' -ErrorAction SilentlyContinue | Remove-AppxPackage -ErrorAction SilentlyContinue"""; Flags: runhidden