It's not only that it is a kepub, but that it is one of the relatively small number of books that do not load on an ereader of any kind--including kobo readers. It is always a good idea to look to see what devices a book runs on. The books that are tablet/app only are often graphics or interactive intensive. Books that run on ereaders, but do not run on non-kobo ereaders usually do not show Blackberry, btw. That is because Kobo no longer has a a Blackberry app.
People have reported that they have gotten refunds from Kobo when this happens.
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