Most "highly compressed" versions (e.g., 500 MB or 1 GB) of GTA 5 are scams or malware
With current technology, a fully playable, highly compressed GTA V under 15 GB does not exist without massive quality loss. Any site promising a "new gta 5 setup exe highly compressed" under 15 GB is either mistaken or malicious. gta 5 setup exe highly compressed new