✅ Buy GTA 4 on Steam, Rockstar Launcher, or get a legit physical copy. If storage is an issue, consider external drives or cleaning up space.

If you manage to download a legitimate copy (approx. 5GB+), here is how you can make it run on a lower-end machine:

The short answer is . To understand why, you have to look at the math:

Therefore, strictly speaking, a fully functional, playable version of GTA IV that is only 32MB in size is .