Everyone knows that we can’t downgrade any iOS apps without a backup file (.ipa) of that App. Because of some reasons, such as critical bugs or lacking of features… sometimes we may want to downgrade our iOS apps. For me, I always use TimeMachine on my Mac, so I can access IPA from my backup. However, most of the users don’t backup their stuffs. That’s why I write this tutorial, with the following steps, you can download any versions of specific iOS app.