diff --git a/client/windows/installer/pangolin.iss b/client/windows/installer/pangolin.iss
index 6dbdb72..37b2abc 100644
--- a/client/windows/installer/pangolin.iss
+++ b/client/windows/installer/pangolin.iss
@@ -3,7 +3,7 @@
 ; 前置: 先在 client/ 跑 `flutter build windows`(Release),产物在
 ;       ..\..\build\windows\x64\runner\Release
 #define MyAppName "穿山甲 Pangolin"
-#define MyAppVersion "1.0.2"
+#define MyAppVersion "1.0.3"
 #define MyAppPublisher "Pangolin"
 #define MyAppExeName "pangolin_vpn.exe"
 #define BuildDir "..\..\build\windows\x64\runner\Release"
@@ -47,3 +47,42 @@ Filename: "{app}\{#MyAppExeName}"; Description: "{cm:LaunchProgram,{#MyAppName}}
 [UninstallDelete]
 ; 卸载清理运行期数据(kernel 配置等)
 Type: filesandordirs; Name: "{localappdata}\Pangolin"
+
+[Code]
+{ ── 升级覆盖修复 ──────────────────────────────────────────────────────────
+  历史坑:1.0.0 的 AppId 是非法 GUID(...PANGOLIN0001),1.0.1 起改成当前合法
+  GUID。AppId 不同 → Inno 视为两个独立产品 → 旧版不被覆盖,控制面板里并排两个。
+  当前 AppId 已稳定(1.0.1+ 同源,会原地升级);此处在安装前再把那个遗留 AppId
+  的残留装静默卸掉,清掉已并存的 1.0.0 幽灵,杜绝多版本并排。}
+const
+  LegacyAppId = '{B2F1B0A0-7A3C-4C2E-9E5A-PANGOLIN0001}_is1';
+
+function GetUninstallString(const SubKey: string): string;
+var
+  s: string;
+begin
+  s := '';
+  if not RegQueryStringValue(HKLM64, 'SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\' + SubKey, 'UninstallString', s) then
+    if not RegQueryStringValue(HKLM32, 'SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\' + SubKey, 'UninstallString', s) then
+      RegQueryStringValue(HKCU, 'SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\' + SubKey, 'UninstallString', s);
+  Result := s;
+end;
+
+procedure RemoveLegacyVersion;
+var
+  uninst: string;
+  rc: Integer;
+begin
+  uninst := GetUninstallString(LegacyAppId);
+  if uninst <> '' then
+  begin
+    uninst := RemoveQuotes(uninst);
+    Exec(uninst, '/VERYSILENT /SUPPRESSMSGBOXES /NORESTART', '', SW_HIDE, ewWaitUntilTerminated, rc);
+  end;
+end;
+
+procedure CurStepChanged(CurStep: TSetupStep);
+begin
+  if CurStep = ssInstall then
+    RemoveLegacyVersion;
+end;