Ok, so what I gather is that the answer to my original question is, no, you cannot repair a Quickbooks for Mac file that will not open due to being slightly damaged. Why didn't anyone just say that?

What a shame, it looks like most of the information from the past 15 months is in there even though the computer may have turned off abruptly damaging a small portion of the file.

I've already tried to open and convert it in 2015, 2016, and 2020. While trying to update the file Quickbooks crashes.