fix windows install

scripts/installer.nsh

@@ -8,6 +8,14 @@
 !endif
 
 !macro customCheckAppRunning
+  ; Pre-emptively remove old shortcuts to prevent the Windows "Missing Shortcut"
+  ; dialog during upgrades.  The built-in NSIS uninstaller deletes ClawX.exe
+  ; *before* removing shortcuts; Windows Shell link tracking can detect the
+  ; broken target in that brief window and pop a resolver dialog.
+  ; Delete is a silent no-op when the file doesn't exist (safe for fresh installs).
+  Delete "$DESKTOP\${PRODUCT_NAME}.lnk"
+  Delete "$SMPROGRAMS\${PRODUCT_NAME}.lnk"
+
   ${nsProcess::FindProcess} "${APP_EXECUTABLE_FILENAME}" $R0
 
   ${if} $R0 == 0
@@ -73,7 +81,15 @@
 
   ; Add resources\cli to the current user's PATH for openclaw CLI.
   ; Read current PATH, skip if already present, append otherwise.
+  ;
+  ; ReadRegStr silently returns "" when the value exceeds the NSIS string
+  ; buffer (8192 chars for the electron-builder large-strings build).
+  ; Without an error-flag check we would overwrite the entire user PATH with
+  ; only our CLI directory, destroying every other PATH entry.
+  ClearErrors
   ReadRegStr $0 HKCU "Environment" "Path"
+  IfErrors _ci_readFailed
+
   StrCmp $0 "" _ci_setNew
 
   ; Check if our CLI dir is already in PATH
@@ -94,6 +110,12 @@
     WriteRegExpandStr HKCU "Environment" "Path" $0
     ; Broadcast WM_SETTINGCHANGE so running Explorer/terminals pick up the change
     SendMessage ${HWND_BROADCAST} ${WM_SETTINGCHANGE} 0 "STR:Environment" /TIMEOUT=500
+    Goto _ci_done
+
+  _ci_readFailed:
+    ; PATH value could not be read (likely exceeds NSIS buffer).
+    ; Skip modification to avoid destroying existing entries.
+    DetailPrint "Warning: Could not read user PATH (may exceed 8192 chars). Skipping PATH update."
 
   _ci_done:
 !macroend
@@ -137,7 +159,9 @@ FunctionEnd
 
 !macro customUnInstall
   ; Remove resources\cli from user PATH
+  ClearErrors
   ReadRegStr $0 HKCU "Environment" "Path"
+  IfErrors _cu_pathDone
   StrCmp $0 "" _cu_pathDone
 
   ; Remove our entry (with leading or trailing semicolons)
@@ -145,8 +169,17 @@ FunctionEnd
   Push "$INSTDIR\resources\cli"
   Call un._cu_RemoveFromPath
   Pop $0
+
+  ; If PATH is now empty, delete the registry value instead of writing ""
+  StrCmp $0 "" _cu_deletePath
   WriteRegExpandStr HKCU "Environment" "Path" $0
-  SendMessage ${HWND_BROADCAST} ${WM_SETTINGCHANGE} 0 "STR:Environment" /TIMEOUT=500
+  Goto _cu_pathBroadcast
+
+  _cu_deletePath:
+    DeleteRegValue HKCU "Environment" "Path"
+
+  _cu_pathBroadcast:
+    SendMessage ${HWND_BROADCAST} ${WM_SETTINGCHANGE} 0 "STR:Environment" /TIMEOUT=500
 
   _cu_pathDone: