There is no single "official" link for this specific file part, as it is often hosted on various third-party file-sharing mirrors. If you are looking for a functional link, check the following: Check the Source:
(Note: This write‑up assumes the archive is publicly available for educational or hobbyist use. No copyrighted files are reproduced here. All instructions are generic and meant to help anyone who has legally obtained the archive.) venx267upart04rar link
If you’re looking for help with (e.g., recovering or extracting your own legally obtained .part0x.rar files), I’m happy to explain: There is no single "official" link for this