Unfortunately there is no straightforward means to add books downloaded via Kobo Desktop to calibre due to the DRM present in the files.
Due to forum rules, we can't discuss HOW to remove DRM; all we can do is suggest you Google for "Apprentice Alf" and see what you find. Additionally, what Alf suggests by default points to ePub format and NOT kEpub format. You can ask Alf though for guidance.
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