Because ADE is so slow (it stops responding while trying to transfer a book to my Kobo), I tried a way suggested in this form. I open the file from ADE in explorer, then copy paste the file to my Kobo. It works, and when I turn on my Kobo it tells me I have new books downloaded.
However, when I try to open the book on my Kobo it says "This document is protected by the Adobe Digital Rights Management and is not currently authorized for use with your Adobe ID. Please sign- in with the authorized Adobe ID and try again". I reconnected my Kobo to my computer and ADE says it is authorized.
Any suggestions? Thank you!!! I'd love to be able to read library books on Kobo again.