while i cant help you out (non 3d artist), you will still face a copyright quandry. Seeiung as you yourself did not A: purchase the model, and B: Did not pay the required membership to even have access to purchase the model, you can likely still get red flagged for using it publically... maybe you might want to consider other options seeing as you may not even be legally allowed to use the model anyways... incidently, I'd recommend reading the terms of agreement on the site, as I haven't, I'm only guessing here.