E_ACT_NOT_READY

I had a similar problem that was created when I bought a new Mac and wanted to use Adobe Digital Editions. I had to deactivate on the old Mac and then activate on the new Mac. I think I did things in the wrong order and it resulted in the error described at the top of this thread.

I am running Mac OS 10.12 and was not able to find the file activation.dat to erase it. I had to show the hidden files in Finder by using the steps found in this article: http://www.macworld.co.uk/how-to/mac-software/how-show-hidden-files-in-mac-os-x-finder-funter-macos-sierra-3520878/

Once I saw the hidden files, I was able to locate the activation.dat file to erase it. I then removed it from the trash and re-launched Adobe Digital Editions 4.5. At that point, I was able to authorize my computer again and everything worked normally again.

The 'regedit' worked for me. My wife's happy as I can now transfer her new books to her Nook. However, shouldn't "De_Authorising" be made much more accessible?

Seems silly to me that you have to go to Community forums to find out the answers. My wife does not use computers and would never have found the answer

I am obtainimg the same error message when trying to associate my PC with my Adobe ID.

Will chat with Adobe support team to see if they can be of assistance.

Clearly, Adobe support does everything  to discourage us from contacting them directly.

Poor Customer service philosophy!

PS: Have already deinstalled and reinstalled ADE to no avail

Activation errors

I have the same issue and have tried everything.  I even chatted online with an agent and they couldn't help me.  I am not sure what to do either.