Instead of hunting for a pre-made "highly compressed" file that might be broken, do it yourself. It takes 5 minutes.
While these files save space, there are trade-offs to keep in mind: How to Play PSP Games on PC with PPSSPP Emulator Instead of hunting for a pre-made "highly compressed"
: Players can fight on two-stage arenas and freely move between the background and foreground during combat. Understanding "Highly Compressed" Versions Instead of hunting for a pre-made "highly compressed"