Because the game does not exist on the platform, almost all of these download links are one of two things:
Authentic PSP ISOs are around 1.6GB. Definitive Edition files are over 10GB. Anything claiming to be the full Definitive Edition for PPSSPP is either: gta sa definitive edition ppsspp
However, where official support ends, the modding community begins. There is a thriving underground scene dedicated to bringing the experience and map of San Andreas to the PSP via PPSSPP. Because the game does not exist on the
Technically, an official GTA: San Andreas – The Definitive Edition does not exist for the There is a thriving underground scene dedicated to
: Many mods are optimized to run at a consistent 30 or 60 FPS on modern hardware. How to Install Modded GTA SA on PPSSPP
Most of these mods aren't standalone games. They are "Texture Packs" that you must manually install into the PSP/TEXTURES folder of your PPSSPP emulator Hardware Demands: