thanks for the reply. I don't think this is specific to my question because Fuji now offers both OS versions to be bought directly on my Adobe account. So I bought the "wrong" one at Adobe's Online "Shop" and I need this to be switched to the Mac OS version.
You can start an on-line chat but I believe payments for add-ons go directly to the developer who I guess would need to arrange a platform swap. But it’s worth a try.
I spent 20 minutes on the online chat on Monday only to be told at the end that the online chat is not for purchases (they didn't know that at the beginning of the chat ?!).
I now contacted Fuji, let's wait and see.
Appreciate your help