To recover from 'bsddb unknowunknown version' I am searching for an old version of Gramps. I took some time to find out Gramps had an error with 9 of the 16 family trees. The most used trees can still be opened in 4.0.3-1. OSX is 10.11.2. My guess is that OSX upgrades caused the problem. I know the upgrade docs of Gramps specifies to backup each family tree before upgrading. But they are not available. I'd like to try to roll back to a previous version, open the failing family trees, backup them, and import thisthese backups in new trees in the recent version Gramps.