Open the webpage below and follow one of the 4 methods on how to install IPA files.

https://techapple.net/2015/01/4-waysmethods-install-ipa-file-app-iphone-ipad-ipod-online-offline-methods/amp/

If you don't want to download an extra program, method #3 is recommended!

If one method doesn't work, try the next one.