Long time iOS users, can you help me?

[Conina]

The apps you bought 10 years ago were 32-bit apps, they can still be downloaded to iOS versions up to iOS 10
Only the popular ones were ported to 64-bit later.

iOS 11 and above don't support 32-bit apps. That's why I kept my iPad Air 1 with iOS 10.3.3 for these older apps/games.