@giododa: What exactly are you trying to do? Step by step directions. PyQt4 imports are only attempted when PyQt5 imports fail; PyQt5 has been present since calibre 2.0 and Kovid said that PyQt6 will automatically be imported when trying to use PyQt5 in calibre 6. I've tried some things involving the conversion GUI in calibre 6 and I can't reproduce this error.
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