UE4 Directory for Maya Velocity Grid?

Where can I find the MayaVelocityGridExporter in UE4 directory? I’m trying to create custom vector fields, but I can’t find the root. All I see is Epic Games in the (C:) Drive and there’s no grid exporter anywhere.

The directions below say to navigate here but I don’t appear to have that directory.
*Inside the file browser, navigate to: [UE4Root]\Engine\Extras\MayaVelocityGridExporter*

https://wiki.unrealengine.com/Creating_Vector_Fields_%28Tutorial%29#Installing_the_.27UE4_FX.27_Maya_shelf_and_FGA_Export_Script