Hi Ty, your render looks great! And yes like you thought and like Pilou said you just use your same license key that you received in e-mail. The original download links in that e-mail expire after 2 weeks but you can get a new download by putting in your license key here: http://moi3d.com/reinstall.htm

And yes like Pilou wrote above, you can install your same one purchased MoI license on any number of machines you own just as long as it's only actively launched and running on one of those installs at a time. You would only need to purchase an additional license for some other machine if you wanted some other person to be running it there at the same time.

One other note, if you're running the new Sierra OS on your new machine, you've got to move the MoI app into the /Applications folder for it to run due to some new download security mechanisms.

- Michael