Forza Horizon 4 is a modern, high-fidelity Xbox One and PC title released in 2018. The PlayStation Portable (PSP) was discontinued in 2014. Consequently, any file claiming to be "Forza Horizon 4 for PPSSPP" is misleading. These files typically fall into three categories: modded versions of older racing games, malicious software, or clickbait designed to generate ad revenue.
If you find a download link with this keyword, it is usually one of three things: forza horizon 4 ppsspp zip file download for android