This topic comes up every so often. In a previous thread, someone consulted a lawyer who said that IHO any picture posted here is arguably "commercial use". You may not be selling it, but by posting it publicly you are advertising your ability and increasing your commercial worth. My free stuff (not at this site) is free. If you can advance your career by using it, I'm happy for you. It's a present. You can do what you like with it, and that includes passing the zip file on to someone else so that they can enjoy it too. The only thing I ask is that is the user doesn't try to sell my meshes or pass them off as his own work. And that's only sensible, because anyone who does that always gets found out pretty quickly with bad consequences.