Blender texture help

So I just purchased this cliff rock set but upon opening it's bare and I have this folder with the textures.

So I followed this principaled shader tutorial to insert the textures but it's not working :( Here's an screenshot with the node setup*

https://photos.app.goo.gl/wnwtEyuRWMz7nWJX7 (sorry I can't seem upload images here so I'll use google)

I've already clicked 'uv unwrap' on the model, anything else I'm missing?