Moved to Digital Edition forums
Sometimes ADE gets its registration/activation confused and in a semi-authorized state..
Try completely removing any authorization using ctrl-shift-D to ADE (cmd-shift-D if on Mac).
Restart ADE, and then reauthorize with your Adobe ID.
If that doesn't work ...
There are lots of bugs in ADE2.0. Try replacing ADE2.0 with the older but more reliable v1.7.2.
Version 1.7.2, it is a little difficult to find, available on Adobe site for Windows and for Mac.
The forum software is sometimes corrupting the link above. There shouldn't be a blank in 'editio ns.html'. The following redirects to the same page: http://tinyurl.com/diged172
Thank you so much for this information! I was able to get the suggested
older version via Tucows.com & we have an authorised pc & two ebooks. My
poor little girl has waited a year to be able to put books onto her
reader. Thank you so so much for your help