Purchase history from the app is not honored in the Mac version

I have already bought two of the dictionaries which provide content for this product running on the iOS platform as in-app purchases. However, that (identical) content is not available to me when I try to “Restore Purchases” on the Mac platform. Since I already have been coerced into buying the iOS product twice, after Duden decided to desupport their Duden-branded app which had been developed and marketed by Paragon, I’ll be d****d if I’ll buy it a third time! Good dictionary (of course), but sleazy marketing.

Tburgueso about Duden Wörterbücher Deutsch, v8.6.864