These mods are designed to run smoothly on the PPSSPP emulator with a minimum of 2GB RAM on Android or Windows devices. How to Download and Install (Modded Versions)
Be very careful; many sites promising "GTA 4 for PPSSPP" provide files that contain malware or adware since the game doesn't actually exist for that platform. 🎮 Best Alternatives for PPSSPP
Some developers create small "demos" in Unity or other engines that look like GTA 4, but these are rarely full games.