you’re welcome, also leaving it here in case anyone needs to download something and don’t have a premium account or trial:
this (scribd.vpdfs.com) is the only site downloader that worked for me: it says that book and audiobook downloads are only available to beta testers, but when you input a book link it gives you the option of downloading the pdf or epub through zoboko.
not sure if it works for all files, and the formatting was a bit off when i tried it, but the content is all there.