Originally Posted by Doitsu
The plugin has been updated for EPUBCheck 5.1.0. Those who downgraded to EPUBCheck 5.0.1 can do the following to have the plugin download and install EPUBCheck 5.1.0:
Select Preferences > Miscellaneous > Open Calibre configuration folder > plugins
Then either delete the EPUBCheck folder or edit EpubCheck.json and change the last_time_checked entry.
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