If you attempt to run a fake 500MB version, the lack of vital game registries and missing assets will result in immediate crashes, missing DLL errors, or permanent system instability due to malware. Safe and Legitimate Ways to Play GTA 5

If internet bandwidth is your main constraint, consider downloading the game overnight using a download manager, or copying the official installation files from a friend's PC using an external hard drive, which you can then verify through Steam or Epic Games. If you want to optimize your setup, let me know: Your PC's (CPU, GPU, RAM) Your current available storage space Whether you want to play single-player or GTA Online Share public link

A 500MB download for a 100GB game is roughly a 99.5% reduction. Any file claiming this is almost certainly just a misleading container, holding a few broken installation scripts or, worse, malicious software. Dangers of "Highly Compressed" Links