Can't de-authorize my Mac

[brunob1810]

Here is the problem:

- I bought an acsm format book and can't add it to the library.

My error code is "Unable to download. Error getting License. License Server Communication Problem: E_AUTH_BAD_DEVICE_KEY_OR_PKCS12"

- I thought ok, maybe by ADE version is too old, or having recently had to re-install all my Mac from a back-up, maybe something to do with it.

- so I downloaded and installed the latest version 4.5.9, but same exact problem.

- so I thought maybe I should de-authorize and re-autorize the computer. But the de-authorization does not work !!

The error message goes: "Unable to erase authorisation. Please try after some time." !! Seriously ?

What can I do to save my problem ? Main one being to add new books to the library but which could have something to do with my de-authorization issue.

Thanks in advance

[Nanaky]

Windows:

    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..

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.