I am getting the exact same error after the update and even got the error by my count at least about 20 or 30 times during the update, had to hit try again each time to complete it. So I will also be needing a ticket opened for this.
Oh and it seem now whenever I go to the support section of my boards in the AdminCP it will keep asking me to log in again. At one point it did that about 6 times in a row. Something definitely broke with this update.