Yes, this is not an issue with MarginNote, but an issue with the App Store. I say it from personal experience. I would suggest in future, don’t buy in-app purchases until you search the App Store to see if there is a Pro version of any app. I don’t like in-app purchases (only thing worse is subscription services), somI always test the free app and if I want to buy the full version I delete the free version first, then buy the Pro version. Yes, you will have to buy a second version, but it is not too expensive. Consider this a lesson we all learn eventually.