Hey Vapor,
Restart XL, and then Immediately start pressing Alt+F2 to get into setup to find the new "License Key";
then copy id to clipboard, and in "xlobby.com/my" delete the old license, and create a new one with the new "key" (8 digit code tied to your hardware).
My understanding is that it is done this way for installers so that if a client "changes" something, the machine will stop working.
I hope this helps,
Samson