Should you avail yourself of the 'full meal deal' for a Benjamin a year (non-commercial Desktop Advanced for $100/yr or your local distro's fee depending on tax regime), something changed this year that has just thrown me for a loop.
On your anniversary you pay your fee, you go to myEsri to verify your licenses, and you see this:
Previous version(s) enumerate(s) Desktop Advanced and Extensions. Current version shows only Personal Use.
So you grab your authorisation code (AC), and in ArcGIS Administrator you go through the routine. snooze
But wait! When it asks if you want to authorise Extensions too, what do you do? You have no AC, do you? gasp