This is a batch file to automatically update your Windows Server 2003 (32-bit) installation offline with all updates released after Service Pack 2, including those released after End-Of-Life, such as those for WannaCry and BlueKeep. (This only includes publicly available updates, not those requiring a support contract.)
Downloads updates unmodified straight from Microsoft.
Updates can be downloaded from Windows (with no extra software) or a POSIX operating system (with curl installed).
Authenticity of updates can be checked if Sigcheck is present. (Use version 2.20 if your computer supports SSE2, or 1.92 if not or if you are not sure.)
After updates are downloaded (and optionally checked), the update process is offline and automatic.