Quote:
Originally Posted by JSWolf
Go ahead and update. It might work and if not, you can always uninstall and go back to 3.48.
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Will you please quit giving people bad advice.
From
New in calibre 5.0--Backwards incompatibilities
Quote:
Because of the support for library wide annotations, the database format was slightly changed. While calibre 4.23 is able to open and operate with calibre 5 databases, older versions of calibre may have trouble.
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bernie