I guess that ' s a replacement for lost karma at bugged bitterfrost merchant . They patched it already and , it seems , they refund the losses . <| sep |> I usually download epup and PDF . Epub because my kobo handles that best , and PDF for the desktop . Also , epub is just a bunch of tarballed HTMLtechnically an XML format files with their assets . Which makes parsing or extracting stuff a lot easier if you ever need that for some reason . I ' m not sure if there simply is no proper standard for embedding highlighted code in an ePUB or if that standard is very poorly supported , but reading programming books in epub on my ereader is often a real pain hence the additional PDF . PDF rendering on many devises is crap , because in PDF the wrapping and formatting is all very hard defined . Eventhough my kobo can read and open PDFs they very often look like crap and are nearly unreadable especially if the PDF is very graphical . Edit I once had an oldish epub about a programming language and the codesamples were no longer to be found online parsing and extracting the snippets from the XML was a fun and not all too hard experience .