Apple frequently drops support for older iPhones. If you own an iPhone 5 or 6 on iOS 10 or iOS 11, the newest Subway Surfers may not be compatible. A lighter, older IPA can run smoothly.
Download the IPA file and install it via AltStore, Sideloadly, or your preferred iOS signer. Requires iOS 12.0 or later.
Use or iMazing ? No – those violate Terms of Service. Instead:
If you are looking to download the game for sideloading on your iPhone or iPad, these platforms are commonly used: Internet Archive