You are indeed right. Github doesn’t go that back. Anyway according to thread " Restoring data issue" v20.9.89 is supposed to read v16.x.x databases. Simply it doesn’t on my machine.
Anyway If I try to go earlier with the versions I get a series of errors all different but similar to this:
At the same time I can still open the same DB with the old version on my old computer with v16.x.x which means it is not corrupted.