Hello, The Parallels End User License Agreement states that you may use one copy of the Software activated by a license key on a single instance owned, leased, or otherwise controlled by you. In order to use Parallels Desktop for Mac on several Mac machines, you need to purchase the corresponding number of licenses. If you would like to move Parallels Desktop from one computer to another, you do not need to buy a new key, simply uninstall the software from the Mac it is currently installed on before installing on a new one. Kindly refer to this article for more info: https://kb.parallels.com/112971 Thank you !!!