NapperC As Spinebot answered, you can install Spine on two computers, but you cannot use them at the same time. Unfortunately, the licensing system cannot determine who is using the software, so if you run Spine on both computers, it cannot tell if one or two people are using the software.
Spine does not always require an Internet connection, so it is possible that you can use Spine on another computer at the same time for a while after activating it, but you will be asked to reactivate it at some point. If you activate too many times in a short period of time, the licensing system will recognize this as illegal use and deactivate your license. If you contact us, we can reactivate your license, but you may have to wait for us to do so. Therefore, if you are running Spine on one computer, you should close Spine on the other computer.