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With calibre 6/Qt6, a problem with Qt4 backward compatibility code has been reported by some users on Windows. This is not needed as the plugins do not support calibre versions using Qt4.
Another issue came up with thread safety. This happened earlier in the year for a few users and the code was developed and tested at the time. It has been reported again with calibre 6. The changes have been discussed and tested in the Kepub Output plugin thread on MR.