Managing plugins license is super easy. You can manage your license your own by login to our site. Just follow the instructions bellow –
Login our site and go to My Account page > Purchase Details Tab > here you will see a link for View License. Click in that link.
Next You will see your license details, here you will see a link for manage your license. Click on that link.
From manage license page you can deactivate site license and add to new site.