Hi Bob, if you've lost your v3 license key I have a page here where you can get it:
http://moi3d.com/reinstall.htm

There are 2 functions on that page - on the bottom part you can put in your e-mail address and have your license key looked up and sent to you through e-mail and on the top part you can put in your license key and get a new download of the installer.

If you are not able to get your license key from there, please contact me through e-mail at moi@moi3d.com

- Michael