I wasn't able to use the updater in one out of 18 sites. Abhishek took a look and saw that there was a configuration error which, once it was identified, I could easily fix. Now 18/18 sites have the most recent version of the corresponding theme as well as the latest versions of Wordpress.
The updater is a fantastic tool, and members of the Elegant Themes support team are equally great.
Thank you, Abhishek!
