E-- Now that Apple allows MacOS and IOS to share purchases between OSs
This is only possible if both apps are under the same App ID, which is not the case for Diarium as it was published before Apple introduced that option to developers. I would have to migrate the iOS app id to the macOS app id or vice versa which I think would be a big hassle (users would have to basically download the app again, delete the old one and somehow migrate the license too, which I don't know how it could be done without an external licensing management on my servers - which is what I want to avoid).
I didn't completely understand your second question, maybe you can open a new thread for this in order to have this discussion focused on Pro version related topics? Thanks!