The addon still supports two sets of textures. Two files for the old Dx9 renderer and three or four files for the Dx11/PBR renderer. Since both sets describe similar things in different ways there needs to be a way to toggle between them when rendering in Blender. That's what the Shader Toggle node you refer to is for. As for your black render: Do the textures show in material viewport shading-mode? If yes, are your lights on a layer that's included in the render? Btw, I'm tentatively planning to make the Dx9 textures go away.