You get which error message if you try to authorize ade?
Close all applications.
Press WINDOWS + R.
In the Open text box, type regedit and then press Enter. The Registry Editor opens.
In the left pane of the Registry Editor, locate the following registry key: HKEY_CURRENT_USER\Software\Adobe\Adept
Remove the Adept Folder.
In the Confirm Key Delete dialog, click OK.
Close the Registry Editor.
Open Adobe Digital Editions and reauthorize..
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.
I followed your steps and now I cannot even read the document in the only device where I could read it.
You must ask his reseller for a new file which are linked right with your adobe id.
Okay, you've approved it. Now what? I am trying to authorize my computer after downloading Digital Editions 3.0 so that I can purchase - and ready - books in the new ePub3 format. That error message is what I've received for the past 4 days! I've not done this before so am not sure what the protocol is now. Do I wait for someone to get back to me with a solution? Should I try the solution you gave to Roberto in an earlier message? If it doesn't work, how hard is it to put things back the way they were?