I've had nothing but problems since upgrading to Piwigo 13.x, and none of the topics I've seen in the github issues or in this forum have helped me resolve them.

Piwigo 12.x worked fine for me. I would like to downgrade Piwigo back to some minor version of the 12.x line while preserving as much of my album structure, metadata, comments, etc as possible. That way I can start from a working install and troubleshoot further, or stay at version 12.x with a working install.

How should I proceed? I've found old guides about downgrading, but nothing within the last few years. I also haven't seen a list of "gotchas" to watch out for, which I'd like to have if anyone can share. Obviously I've backed up the piwigo directory and database.

Thanks for your help!