We cannot transfer iReal Pro between the Android, iOS, Mac, and Windows versions. Each store, Google Play, Amazon, the Microsoft Store, and Apple's App Store and Mac App Store, has its own separate billing, and none of them allow a purchase to move to another store.

 

Each platform is a one-time purchase of its own version of iReal Pro.

 

For more, see Buy iReal Pro and use it on your devices on the iReal Pro website.