What I was alluding to in the previous post is check your platform before upgrading. Apple incorrectly reports that the app “Works on this iPad” on my IPad mini 2 which has iOS 12.5.5 yet SS7 Pro requires iOS 14+.
I believe a refund is possible through Apple if the app doesn’t run because of iOS incompatibility when Apple tell you it’s compatible (at least this was the case so check first). (This happened to me with another App). Not sure if it applies to every app.
Sky Safari 7 Pro is for iOS 14+. See
https://skysafariastronomy.com/