Any "God of War: Ascension PPSSPP Zip" or "Highly Compressed" file found online is almost certainly

How to Play God of War Ascension on PC - RPCS3 Full Tutorial

In this post, we will explore how to download and play God of War: Ascension on your device using the PPSSPP emulator, which allows you to play PSP games on various platforms.

If you strictly want to use the PPSSPP emulator on Android or PC, use these authentic titles: God of War: Ascension - RPCS3 Wiki