Error Message E_AUTH_BAD_DEVICE_KEY_OR_PKCS12

I know I have been told to deactivate my ID and then reactivate it. I was told to go to the help menu to do this. Guess I am kind of dumb but don't fully understand. I have gone to the help menu on for Adobe digital but can't find a place to deactivate it.

Full error message is  Error getting license    License Server Communication problem  E_AUTH_BAD_DEVICE_KEY_OR_PKCS12

This problem started because I was trying to download a book on a computer in another city. Live chat support helped download the book but now that I am home and adobe digital doesn't work on my computer they say they can't help me.