Quote:
Originally Posted by theducks
Once upgraded, some plugins will no longer work (they never got python code updated), Others will notify you in the lower corner, so be sure to do those.
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Quote:
Originally Posted by ownedbycats
Yup! Just backup your library and plugin; downgrading Calibre after upgrading the database will cause errors (mostly upon deleting book) and sometimes it's hard to get older plugin versions. Note that some incompatible plugins just silently deactivate themselves, so make sure everything's in order.
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(ducks and cats and all

)
I'm now updated to the latest version and everything works great, including the DRM plugins, my biggest worry and main reason for delaying on the upgrade.