I can help with legal alternatives and related content — pick one:

If you're looking for a "highly compressed" file, be careful. These often contain malware or are simply corrupted. Always download your ISOs from reputable community sites and use the official PPSSPP site for the emulator itself.

Instead of using PPSSPP, Android users with decent hardware can emulate the console versions for the best graphics and full story.

OpenGL or Vulkan (Vulkan is usually faster on newer phones). Mode: Buffered Rendering. Frame Skipping: Off (or 1 if your phone is very old).

. Consequently, there is no official Resident Evil 4 ISO file for the

Which would you like?

The file you need has a or .cso extension. A clean ISO size is roughly 900 MB to 1.2 GB ; if you find a file smaller than 800MB, it is either a demo, a corrupted file, or a virus.