I keep getting this message and older forum discussions (2012-13) have not helped me, so putting this out there again in case there is another answer. I downloaded the ADE 2.0 and when I tried to download a library ebook, I got the authorization window. I've done this many times before because I do this for the library where I work. But the error message kept popping up.
I've tried cancelling and retrying, no luck. I've tried the cntrl+shift+D but nothing happens when I hit those keys. The computer runs Windows 8. Could that be the problem? In a previous forum, someone said he tried it over a few weeks before it worked. Obviously this is difficult to do when working with someone else's computer.