On iPhones and iPads, sideloaded apps rely on "enterprise certificates" that Apple regularly revokes. When that happens, the app simply refuses to open—often in the middle of a gig or practice session. To fix it, you’d need to re-download a new crack, losing all your saved songs and playlists.
iReal Pro does not use "license keys." It is sold exclusively as a one-time purchase through the Apple App Store, Mac App Store, Google Play Store, and Amazon Appstore. Your license is tied directly to your platform-specific account (Apple ID or Google Account). Troubleshooting License Issues
If you own the app on an iPhone (iOS), you must purchase it separately to use it on an Android device or a Mac computer.