I am running ADE on Windows 10, but can no longer download books. The authorization is from an old email account that is no longer active and the password is lost. I have tried to deauthorize by deleting the adept registry key with no success. I have also tried removing and reinstalling the ADE program. In both cases the key reappears and the program remains authorized to the old Adobe ID. How do I clear this authorization so that I can use a new Adobe ID?