Quote:
Originally Posted by Calistn
I mean are not these databases meant to be able to be imported/exported over from one version of calibre or installation/PC to the other?
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There have been changes made so databases may not be backward compatible. That is you can install calibre 7.10 over calibre 3.48 and the database will be upgraded. Installing 3.48 over 7.10 will not downgrade the database so there is a chance that you will run into issues.