Hi Ronald,
Thank you for your quick reply.
Following your suggestion I have uninstalled the app and then installed it again. The behavior is the same after the re-install.
I then opened the app on my iPhone (which is running the same iOS 9 beta as my iPad) and purchased the Automix feature again, expecting that it would tell me that I had already bought it. That was not the case, apparently it considers the two apps as separate
Anyway, the exact same thing happens on my iPhone as on my iPad. Endless twirly, no download.
Could this have anything to do with the fact that I'm using the public beta of iOS 9?
Rgds/M