Quote:
Originally Posted by ownedbycats
Make sure to backup your metadata.db; there's some changes to the database structure and reverting to an older Calibre after it upgrades tends to cause errors.
I also suggest backing up the plugins folder from appdata; sometimes getting older versions of plugins is tricky.
Then upgrade. Don't be surprised if some of your plugins seem to disappear - chances are they just failed to load and got deactivated because they're outdated. Just re-download the newest version.
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Are these on the Calibre software? (metadata and app data)