If you have an subscription, you can stream the full, official version of Forza Horizon 4 (and Horizon 5) directly to your Android phone via the cloud.
If you specifically want a native app to download, check these out: forza horizon 4 ppsspp zip file download for android
If a site asks you to download three other apps to "unlock" your Forza ZIP, it is a scam. If you have an subscription, you can stream
If you see websites offering a "Forza Horizon 4 ISO" or "ZIP download for Android" for the PSP emulator, they are almost certainly providing a (like Forza Motorsport 2 or a Need for Speed title) with updated textures, or worse, malicious software. If you have an subscription
Offers a similar "vibe" to Forza’s street racing.