DoN's 3D-Pathfinding / Flying-AI system (with full source!)

I was trying to find the custom event customAddMovementInput like the one below for a day or two, but was having no luck. I can find the customAddMovementInput (message) and (interface), but not the (event). I see that the target of this custom event is DonNavigator, but neither did I find the object with the class DonNavigator, nor the class DonNavigator. I am using the bp plugin from Unreal MarketPlace. Am I missing something?

https://forums.unrealengine.com/filedata/fetch?filedataid=145854