I'm receiving this message:
Error getting License. License Server Communication Problem: E_ACT_NOT_READY
I cannot erase the authorization because I don't have the password associated with my old email address, and that email is no longer active. How can I get that account erased?
After over 3 hours of chat, which resolved nothing, I skipped the first steps of the process below, (as I was unable to do them without a password), and went to the "extreme cases" steps***. After dragging the.dat file to trash, I was able to authorize my computer using my new adobe ID. No thanks to Adobe tech support.
This can often be resolved by completely removing any authorization using ctrl-shift-D to the Library screen on ADE (cmd-shift-D if on Mac).
Restart ADE, and then reauthorize with your (old) Adobe ID.
*** In extreme cases on the mac, the following extra step has helped some people. 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 Access hidden user library files