Material Paramter Collection problem

I’ve been following a tutorial on adding snow cover with MPCs, I’ve ran into an issue where I’m getting a ton of errors he doesn’t get (I’ve followed to the dot aside from the materials he used, I couldnt find them.)
Tut: UE4 - Snow Cover - Material Parameter Collections - YouTube

I’m stuck around 46 minutes.
The errors are SM5: ML_Snow missing function input ‘Micro’ ‘Macro’ SM5: Error on property roughness
and a ton of others.

I’m sure materials have changed since last year so maybe this just wont work anymore.