From the Stardock FAQ page -
Q: I have a laptop and a desktop. Can I install the software on multiple machines?
A: Yes, to a point. Only 1 copy of the product can be used at once per license. But if you want to have it on both home and work or install it on the road that is not only allowed but recommended. As long as only one copy is actively in use (someone sitting at the computer) at any one time, you are covered.