This update was released by Rockstar Games to primarily address security vulnerabilities in GTA Online on PC and include various stability fixes.
While a standard GTA V installation now requires roughly 120GB to 150GB due to years of GTA Online updates, a "repack" version often compresses this to between 40GB and 60GB for the initial download. Key Components Typically Included
This indicates the "repacker" or uploader of the torrent. Repackers like Kirigiri specialize in taking the original massive game files and compressing them significantly to make the download faster for users with slower internet or limited bandwidth.
Because repacks are heavily compressed, the "unpacking" process on your computer can take several hours and requires significant CPU power and RAM.