Hey Craig,
It looks like your UI is displaying differently from what is in Github. I don't see the windmills in Completed Scene either. Have you been making any specific modifications to the project? There is a chance that while going through the tutorial, something got changed that isn't causing a crash, but is making things act strange.
If it's not too disruptive, you could re-clone the Github project, and then open Completed Scene, past your ADT URL into the ADTConnection prefab, create a new credential and connect that to the ADTTurbineAlertController.
If you do this, it should work fine. I know it's an inconvenience, but it may be difficult to determine why the UI looks different and why the Windmills aren't loading and easier to just start fresh and redo these final steps.