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First off, you are not using the current version of calibre. The second issue is that you downloaded the KePub version when you should have downloaded the ePub version.
On the Kobo website, select My Account and then Books. Find the cover of the book you want. Then select the three dots and then download. If the eBook has DRM you will get the ACSM file to use with the DeACSM plugin or Adobe Digital Editions. If the book has no DRM, you will download the ePub.
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