Thank you for the link. But I get the answer: Authorization can not Erase. Try it later.
Do you now what happens?
There can be various reasons why you could not de-activate successfully.
Can you try to reboot the machine and try again?
If De-activation still does not work, then you can follow the following steps:
Kill ADE : On your mac, Press "command-Q"to kill ADE.
Then Navigate to /Users/Library/Application Support/Adobe/Digital Editions and drag the activation.dat file to the trash.
It should delete the activation record from mac.
Now when you launch ADE, you will no longer be activated.
I hope it helps.
thank you for these tip.
I was a little afraid, because there are over 300 books in the library.
I did ist in your way, it works and all books are at the same place.
Many greetings and a wonderful weekend
Glad to hear this, Barbara.