Seraphine I also had a problem with not getting an EPUB ebook from Kobo on Sunday - instead I got a kepub.
Here's a link to how I handled it's
conversion from kepub to EPUB.
However, apparently my ebook must have been DRM free (it's an O'Reilly) and that's why I could do what I did. (So I was told in that thread).
See what you think