The Preservation of Portable Piggy Destruction: An Analysis of the Angry Birds Epic IPA File Format
Since the App Store won't verify these files, you need a "sideloading" tool to install the game on your iPhone or iPad. Method 1: Sideloadly (Recommended) angry birds epic ipa file
Once you have the IPA file, you need a way to "sideload" it onto your device using a computer: The Preservation of Portable Piggy Destruction: An Analysis