This is important: We found a problem with recent Android Oreo updates: The system allowed RetroX to install one or two emulators then stopped installing anything else. The behaviour that you can see is that RetroX will prepare to install an emulator and then it does nothing, or sometimes the install window is seen on
The Oreo release of Android broke several emulators and most of them have been fixed up to this date, but one particular exception is the Amiga emulator (UAE2All2) which will require more time to fix, or as an alternative, be replaced by a new emulator. Some fixes in Oreo made some hidden bugs become evident