Have you done a check to make sure there are no problems in the epubs? It might be that there is something wrong in the epub that is causing Calibre to get hung up. Or something in Calibre is corrupted and you need to re-install it. Or if the book has DRM that will keep it from converting. For that you need to consult Apprentice Alf though as posts that give detailed information about DRM removal aren't allowed here. Google is your friend there.
Last edited by crich70; 03-03-2018 at 08:35 PM.
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