I received the Adobe Photoshop Elements 2021 - an upgrade from 2012 - for Christmas. I uploaded photos and attempted to look at them later. I was unable to open the organizer. I can open editor, but still not organizer. Any suggestions?
If you press the Shift key while launching the Organizer, the Manage Catalogs dialog should open. Create a new empty catalog and see if you can open the Organizer with it. If you can, try going back to the File>Manage Catalogs dialog and try repairing and optimizing the original catalog if it is available. Upon completion of those operations, see if that catalog will open in the Organizer.
If that doesn't work, lauch the Organizer with the Shift key pressed and open the new empty catalog again. Go to Edit>Preferences>Media Analysis and uncheck all boxes. Then return to the Original catalog and see what happens.
And before doing any of that, I suppose I should ask whether you attempted to convert what I assume is your version 12 (not 2012) catalog. Or did you create a new catalog upon first launch of your Christmas present? How did you import (upload?) files into that catalog?