The plugin hasn't ben updated in a while and is likely deprecated. We plan on updating it in the future after we release the new Unity Substance plugin.
I love stuff like this. And hopefully it leads to some interesting gameplay in the future. I feel games today are far to reliant on combat for everything.
Thank's Danny ... I just bought your "Sustance Painter To Vray" tutorial, cool stuff ) , anything "arnold + substance" in the future, and it's a insta-buy !