Quote:
Originally Posted by jbusnengo
If I were to temporarily go back to Calibre 8, would it work with a Calibre 9 database, or would I have to rebuild it?
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Onve a schema upgrade has been done on an upgrade, calibre will not reverse it. ie Once the isbn column has been removed the only way to get it back is to either restore your backed up database (you DO take backups, right) or reinstall calibre at the old version and create a brand new library and reload all content into it.