Repackers like FitGirl, DODI, or CorePack do compress games, but even their most extreme compression for GTA V results in:
If you truly can’t handle the full ~100GB game, consider these options: Gta 5 Highly Compressed 300mb For Pc
Even if you find a heavily compressed version, your PC must still meet the base architecture requirements to run the game engine. Repackers like FitGirl, DODI, or CorePack do compress
If you are desperate for a Grand Theft Auto style experience on a PC that can only handle 300MB files, stop trying to run GTA V. Run a different game. Repackers like FitGirl