They achieve this by heavily compressing the installation files and sometimes making non-essential data (like alternative language packs or multiplayer assets) optional.
Compressing 110 GB into 100 MB requires a compression ratio of roughly 1100:1 . Audio and video data—which make up the bulk of GTA V—are already compressed and cannot tolerate this level of shrinking without being completely deleted. How to Get GTA V Safely and Legally download gta v highly compressed 100 mb for pc top
Grand Theft Auto V PC system requirements - Rockstar Support They achieve this by heavily compressing the installation
Any file claiming to be the full GTA V game at only 100 MB is almost certainly or malicious . download gta v highly compressed 100 mb for pc top