Duplicati no longer launching on Mac - database version?

[JonMikelV]

Just for reference, here’s another database version post:

Cannot start Duplicati - "Error: UsageReporter failed"

Yes I tried this but not much useful information. In the end, I received a message saying the DB version too high for the Duplicati version I was using (I had tried to downgrade to an earlier version). Uninstalling and re-installing did not help, not even after a manual clean of system files and registry. Fortunately I had stored an old version of Duplicati on a separate disk, and that one started like a charm. So I did a brute file copy to the standard location of Duplicati, and from then on…