As long as you are the only user of the Software, you can install it on your second (third) computer without restrictions.
Companies are allowed to share the licenses between employees, providing that the total number of concurrent users never exceeds the number of purchased licenses.
To use the license on another computer simply download the software there and activate it with the license key you have. Make sure that the number of running copies stays below or equal to the number of licenses you have.
Customer support service by UserEcho