I used Digital Editions to transfer e-books borrowed from my library to my Nook. I had computer problems and lost my digital editions. I have now reinstalled it. I am trying to authorize this new Digital Edition with my Adobe ID, but it will not let me, saying, "You can only authorize this computer with an Adobe ID that hasn't been previously used to authorize any other computer or mobile devices. Please try again."
Open Adobe Digital Editions.
Press Control+Shift+D to deauthorize Adobe Digital Editions.
Select Erase Authorization.
Click OK and quit Adobe Digital Editions.
quit Adobe Digital Editions.
Navigate to /Users//Library/Application Support/Adobe/Digital Editions and drag the activation.dat file to the trash.
If you are using 10.7, see https://helpx.adobe.com/x-productkb/global/access-hidden-user-library-files.html
Open Adobe Digital Editions and reauthorize.
This is great, thank you. However, now when I try to transfer a book to the Nook it says, "CE-COPY-NOT-ALLOWED-No permission to copy the book." I have done this many times prior to reinstalling Digital Editions, what am I missing now?