The answer to the question from the Support FAQs:
How many computers can I install the software on? What if I have multiple computers?
Installation: The software can be installed on up to 2 computers that you personally own and use.
Usage: You can use the software on 1 computer at a time.
For example, if you had a laptop and a desktop, you could install the software in both locations, but you should only use the software in 1 location at a time.
Please note: Simplify3D licenses are sold as individual user licenses. A single user license should never be shared by multiple individuals.