I appreciate your post and was able to find the information field in my Themco account where you enter your staging info to activate it.
I tried entering the localhost staging license URL in the available field but was not successful when I entered my purchase code in the wp-admin to activate the local license. Perhaps there are certain requirements for the local install of a staging site to qualify it as a valid "staging license.
I read another post while searching for the answer and got the impression that the staging site must be a clone of the live site. I have a youtube video demoing how do that and have attempted to do it a couple of times but when it appeared that I successfully implemented the steps to bring my live hosted site local server on my computer, it became very confusing.
When I would log-in through the localhost with a new Wordpress database, as soon as I logged into the wp-admin and start to change update my plugins and my x-theme, it seemed to be doing it on my live site and once I attempted to do that from the entry point of the localhost it deactivated my live host license.
I was able to get my live host site activated again by performing a restore from an older backup. After that experience, if I understand the concept correctly once you have a cloned live site, you are working with two separate Wordpress connections to the live site, (one live wp database and one local database). I believe if you want to maintain your live-theme license, you must remember to log-in through your live site wp-admin and make your updates there. Then close out of your live site login and then log-in through your localhost login and you should see the cloned version of what you updated. If you forget to do these exact steps and try to update your live site through your local login settings, you will trigger your live site license to be revoked disallowing any further update privileges.
This made me very uneasy and I have since not been able to confirm if I understand this correctly,
If you or anyone else learn more about the proper steps on how to correctly setup a staging site and enter the proper information to activate the x-theme staging license field to enable privileges to access the extensions and live updates and can get back to me, I would appreciate it very much.