@jjones Now THAT, I'm not at all surprised by. While it technically works under 10.11, the App Store won't allow it to be directly installed to 10.11. Apple has also apparently pulled it from the App Store, but it remains available for those who have already downloaded it. It is pretty clear that Apple considers Configurator 1 to be a dead product.
I'd love to make the leap to Configurator 2, but since it doesn't have the ability to auto-refresh devices that get plugged in, it's a hard sell. GroundControl offers that ability back, but it is a bit cost prohibitive, especially if you are already paying for an MDM license.