How extract apps from a iTunes backup file?
iTunes hasn't saved or restored ipa files in a long time. Apple expect you to recover everything OTA [over the air] these days &amp; assume you have a current online backup over iCloud. 

This function change arrived with version 12.7 - http://osxdaily.com/2017/09/13/itunes-12-7-update-removes-app-store/

If you do already have an ipa of an app no longer available from the App Store, you can use Apple Configurator 2 to restore it to the phone. There are other MDM solutions that allow tethered app installation as well if you really need that capability.


https://www.groundctl.com/docs/425