Can’t even get it to open

My husband downloaded this for me when I talked about how I loved the original PC version years ago. I’ve downloaded it multiple times and all it says is realMyst is damaged, please download again from app store. I’ve done this multiple times and still can’t get it to work. Please fix this or refund my money. I’m very sad that I can’t play this game. My husband emailed about this and we haven’t had any response.

MedicMeg83 about realMyst: Masterpiece Edition