Claims of 4 MB or 100 MB versions of the full game are fake . These archives often contain "white noise" or self-replicating files designed to waste your time or infect your PC. How to Install a Compressed GTA V Setup
If you have a legitimate compressed archive from a trusted source, follow these steps: gta v setup download highly compressed
Usually reduce the size to roughly 50% of the original (around 50–60 GB) by compressing textures and audio without removing content. Claims of 4 MB or 100 MB versions of the full game are fake