Just getting underway early with my next OU postgrad module, M813 Software Development, and most of the module materials are downloaded as EPUB files but not PDFs. Which is a minor inconvenience. So, searching for how to read an EPUB file, I stumbled across this blog post on lifewire.com which provides links to various free software for reading EPUBs. Note that, although EPUB files can be read straight away in Nook & Kobo ereaders, they need converting to read on a Kindle (or in the Kindle app on your PC or smartphone).
I just downloaded the Adobe Digital Editions platform (download available here). Another cool tip is to rename a copy of the EPUB file with new .zip file extension, then extract it in the normal way. This provides text which can be read as HTML, + other images etc. Alternatively the Calibre program does allow you both to read EPUB files and to convert them to Kindle-friendly format, PDF, etc. But I gave it a try and the PDF it produced wasn’t too great, so I gave that option a miss.