Downloaded ADE 4.5.2. Get 'Error! Check Authoirization' box

[Seve Jr.]

After deleting my original version of ADE (2012), I downloaded the newest version of it-ADE4.5.2.  I logged into my OMNI library account and picked a book.  When I go to 'download epub ebook', I get a box in ADE that states 'Error! Check activation'.  I've tried to erase my current activation but cannot find or remember the correct password to erase it (I've tried many different passwords--none work).  How do I find what that password is?  Am I on the right track to try and erase, then reauthorize my computer?  Currently, the 'authorize computer' is grayed out in ADE.  I've been trying to resolve this for a week and a half, but no one seems to know what to do.

[Nanaky]

Windows:

    Close all applications.

    Choose Start > Run.

    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

    Select the Adept key.

    Choose File > Export.

    In the Export Registry File dialog box, select Selected Branch under Export Range. Enter a name and location for the backup registry key, and then click Save.

    Right-click the Adept key and choose Delete.

    In the Confirm Key Delete dialog, click OK.

    Close the Registry Editor.

    Open Adobe Digital Editions and reauthorize.

Macintosh:

    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.