Established repacking groups (like FitGirl Repacks) can reduce the download size to roughly 35–45 GB using advanced compression. These versions contain the full game but take a long time to install as the files must be decompressed.
Grand Theft Auto V PC system requirements - Rockstar Support
The GTA 5 Highly Compressed UPD is a compressed version of the game that can be downloaded from MediaFire. The "UPD" in the title refers to the updated version of the game, which includes the latest patches and fixes. The highly compressed version of the game is around 2-3 GB in size, which is significantly smaller than the original game size of around 65 GB.
The inclusion of "UPD" is interesting. In the warez and repack scene (FitGirl, Dodi, etc.), "UPD" usually signals that the uploader has updated the compressed files.
Originally, many GTA 5 repacks from 2015 were missing updates. Searching for "UPD" implies you want version or higher (the latest before the next-gen update). Users want a compressed version that includes:
The “UPD” tag is meant to suggest an updated version with bug fixes or online support. In legitimately compressed scene releases (like FitGirl Repacks), updates are clearly documented and still require a legal copy. The Mediafire versions cannot be updated because they don’t contain a genuine game foundation.