There is no magic "500MB" version of GTA 5. The download bandwidth required for the high-quality textures and map data simply does not exist at that size. If you want to play the game, you must download the full ~72GB+ version from a trusted source. Avoid the 500MB scams to protect your PC from malware.
If you download a file labeled “GTA 5 highly compressed 500MB fix” from YouTube, torrent sites, or shady forums, you’re getting one of these: gta 5 highly compressed 500mb for pc fix
Let’s be clear on the technical limitations. The original GTA V contains: There is no magic "500MB" version of GTA 5