unable to deauthorise digital editions on a Mac from an old email address (provider shut down), and wish to authorise using my new address
Problem has been solved by the following from bmorgan54 - thank you
Hope this helps.
A few months ago I changed my Adobe ID and password. Fast forward to now and I'm having the same prob as everyone else. Here's what worked for me:
1. Go to the Finder menu.
2. Hold down the Option key and select Go. This reveals the hidden user library.
3. Select Library.
4. Go to Application Support -> Adobe -> Digital Editions and delete the file named “activation.dat”
5. Now one can reauthorize Adobe Digital Editions.