Installer: Ignore any leftover files after uninstalling old version (#4760)

app/win/installer/installer.nsi

@@ -218,37 +218,26 @@ Function UninstallOld
     ${GetFileName} $3 $4
     StrCpy $5 $4 6
     StrCmp $5 "Zotero" +1 continue_installation
-    RMDir /r /REBOOTOK "$3\chrome"
-    RMDir /r /REBOOTOK "$3\components"
-    RMDir /r /REBOOTOK "$3\defaults"
-    RMDir /r /REBOOTOK "$3\dictionaries"
-    RMDir /r /REBOOTOK "$3\extensions"
-    RMDir /r /REBOOTOK "$3\fonts"
-    RMDir /r /REBOOTOK "$3\gmp-clearkey"
-    RMDir /r /REBOOTOK "$3\uninstall"
-    RMDir /r /REBOOTOK "$3\xulrunner"
-    Delete /REBOOTOK "$3\*.chk"
-    Delete /REBOOTOK "$3\*.dll"
-    Delete /REBOOTOK "$3\*.exe"
-    Delete /REBOOTOK "$3\Accessible.tlb"
-    Delete /REBOOTOK "$3\dependentlibs.list"
-    Delete /REBOOTOK "$3\firefox.VisualElementsManifest.xml"
-    Delete /REBOOTOK "$3\omni.ja"
-    Delete /REBOOTOK "$3\platform.ini"
-    Delete /REBOOTOK "$3\precomplete"
-    Delete /REBOOTOK "$3\voucher.bin"
-    RMDir /REBOOTOK $3
-
-    ${If} ${FileExists} "$3"
-      # If the directory still exists, check if current user is Admin.
-      # For Admin users, /REBOOTOK works and directory will be removed after reboot
-      # For non-Admin users, we display a message and quit
-      UserInfo::GetAccountType
-      pop $0
-      StrCmp $0 "Admin" continue_installation
-      MessageBox mb_iconstop "The previous installation of Zotero could not be removed. Please manually delete the following folder, and then run the installer again: $\n$\n$3"
-      Quit
-    ${EndIf}
+    RMDir /r "$3\chrome"
+    RMDir /r "$3\components"
+    RMDir /r "$3\defaults"
+    RMDir /r "$3\dictionaries"
+    RMDir /r "$3\extensions"
+    RMDir /r "$3\fonts"
+    RMDir /r "$3\gmp-clearkey"
+    RMDir /r "$3\uninstall"
+    RMDir /r "$3\xulrunner"
+    Delete "$3\*.chk"
+    Delete "$3\*.dll"
+    Delete "$3\*.exe"
+    Delete "$3\Accessible.tlb"
+    Delete "$3\dependentlibs.list"
+    Delete "$3\firefox.VisualElementsManifest.xml"
+    Delete "$3\omni.ja"
+    Delete "$3\platform.ini"
+    Delete "$3\precomplete"
+    Delete "$3\voucher.bin"
+    RMDir $3
 
   continue_installation:
     ; End uninstallation