Just an FYI…
The readme.txt file in the demo project says:
“1) Make sure you have Ignition 7.1.2 or above. If you do not have Ignition 7.1.2 please download it from inductiveautomation.com/downloads.
To check for you Ignition version please login to the Ignition Gateway Configuration section and check under System -> Status.”
I don’t see 7.1.2 on downloads page.