Thanks guys!
Snowshoe, how frustrating. So the reader is working but you can't access the library site and the book won't download. Hmm, I'd be inclined to contact the library support. Are you in the US or somewhere where you can get phone support from Sony, or email them? I haven't used their site, so I'm not familiar with how it works.
Or you could try searching here to see if others have had the same problem - worked for me yesterday!
Have you seen the books available here too?
https://www.mobileread.com/forums/ebooks.php?forumid=126 These are all formatted for Sony readers.
Good luck!
Have you