Because repacks are heavily compressed, the "unpacking" process on your computer can take several hours and requires significant CPU power and RAM.
This update was released by Rockstar Games to primarily address security vulnerabilities in GTA Online on PC and include various stability fixes.
Files downloaded via torrents from unofficial sources carry a high risk of containing malware, miners, or spyware. Users often rely on community forums like the CrackWatch subreddit or 1337x to verify the safety of specific uploaders.