I honestly don't know.
The email from IT was to install ees_nt64.msi and follow the installer's displayed instructions.
I ran the installer, in that process the installer turned off the firewall, installed the update and then said a restart was required. I then restarted. When it restarted it had a warning that the firewall was disabled and needed to be restarted. I selected restart firewall.
For the machines that worked, it then said you are protected. For the one machine I'm writing about it just continued to display that warning.
What is an ESMC upgrade task?
The other 17 machines upgraded without anything other than the installer. Sorry I don't have more to share than that.