What Platform Daemon is currently running?

You can check if the Niagara service is running correctly from your Windows Control Panel, "Services" and also check the version of Niagara that is running.

And see if the "Niagara" service is shown as "running"

By double-clicking on the Niagara service you will see the details of the service that is running and from the "Path to executable" you can determine for which version it is running.