You cannot simply download an IPA and tap it on a non-jailbroken iPhone. Apple blocks sideloading. Here are the for making a Minecraft 1.15 IPA work.
: Works offline, permanently. Con : Requires jailbreak (impossible on iOS 15+ for most devices). minecraft 115 ipa work
You cannot simply download and open the file. You must use tools like Sideloadly You cannot simply download an IPA and tap