The absolute safest, most ethical, and most reliable way to play GTA V on your PS3 is to avoid compressed repacks entirely and use official channels. While the PS3's online store has been restricted, the game is still available for those who own it.
If you have a 12GB PS3 Super Slim and want to play GTA V via a compressed file, you have a modified console (CFW/HEN) and an external hard drive. The internal flash memory is simply too small. Here is the common installation pathway using an external HDD and webMAN MOD : Gta V Ps3 Highly Compressed