iReal Pro 6 and higher includes 50 accompaniment styles.
The additional IAPs Blues styles/Salsa styles can be purchased on iOS/Android/Amazon devices with iReal Pro 8.0 or higher inside the app in Settings / Store (or in old versions, More / Store) and purchased for Mac OS.
IAP purchases cannot be transferred or shared between the different App stores, i.e. iOS/macOS/Android/Amazon.