One license of the software can be used by one user, on one machine and in one OS, if you need to use the software on another machine or in another OS, you need to shift the license to the new machine or new OS, and your old installation will lose its license automatically.
To shift the license is very easy, just install and activate the software in your new enviroment, you can do by yourself at anytime.
You may find more details in the activate section:
If you have any other questions on software license shift, please contact our support team: support@easynth.com