Stick to trusted communities (Reddit’s r/PPSSPP, r/EmulationOnAndroid) and always scan your files.
If you search Google or YouTube for "GTA SA Definitive Edition PPSSPP download," you will find many results. gta sa definitive edition ppsspp
First, a quick clarification: there’s no official “Definitive Edition” of GTA: San Andreas for PSP. The PSP version is simply Grand Theft Auto: Liberty City Stories or Vice City Stories . However, some fan-made mods or “Definitive Edition” conversions attempt to bring GTA: San Andreas to PPSSPP, often by porting assets or using modified ISO files. The PSP version is simply Grand Theft Auto:
: Most "GTA SA PPSSPP" files are actually total conversion mods of GTA: Liberty City Stories or GTA: Vice City Stories . Modders replace textures, map assets, and character models to recreate CJ’s journey in Los Santos. Modders replace textures, map assets, and character models
The quest for is a journey of compromise. Officially, it is impossible. Unofficially, through the magic of modding, upscaling, and shader tricks, you can get a "Definitive-ish" version of San Andreas running on Sony’s classic handheld emulator.