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There are two different KFX plugins. You need to install the KFX Input plugin to convert books from KFX format to other formats and the KFX Output plugin to convert from other format into KFX. Make sure that you have installed KFX Input if you want to convert from KFX.
If that isn't the cause of your issue then please provide more detail on what you are doing and the exact messages that calibre is giving you.
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