Hi Steve, there is some kind of bug with the Mac version 30-day trial which is preventing it from working properly on some people's machines. I have not yet been able to figure out what's wrong with it. I'll probably be reworking the expiration mechanism soon to try and fix it up.

In the meantime if you e-mail me at moi@moi3d.com I will be able to send you a link to a different version that should work for now.

- Michael