If you're looking to download the Resident Evil 4 PSP ISO, you're likely searching for a way to play the game on an emulator or on your PSP device. Here are some essential points to consider:
Once you've found a reliable source, navigate to the Resident Evil 4 PSP page and download the ISO file.
A: In the US, even if you own a physical copy, downloading a separate ISO from the internet is copyright infringement. You must dump your own disc to a legal backup.