Hi mrninja13, you can install the same one purchased license of MoI on any number of your machines (like on both your desktop and laptop machines), including across Windows and Mac operating systems, just as long as it's only actively launched and running on one of those installs at a time. You only need to purchase a separate license for another machine if some other person is going to be using it there the same time as you.

You don't need to do anything special to set up the multiple installs, you just use the same installer and same license key on each one. MoI does not bind itself to a specific hardware signature or anything like that.

- Michael