A "Repack" generally refers to a file that has been modified or bundled by someone other than the original developer (Microsoft).
For direct access, visit the Microsoft Update Catalog website, search for the KB number (958488), and download the appropriate version for your system architecture. Windows6.1-kb958-488-v6001-x86.msu Download REPACK
Always scan downloaded files with your antivirus software before installing. A "Repack" generally refers to a file that