The Lite version has no limitations on usage.
If you bought the Pro/Pro Plus versions you will need to buy an additional license for each client. The option to purchase an extra license is available in the account center you originally downloaded the plugin from. This will entitle you to get support for that domain as well.
If you are buying it on behalf of that client you need not buy an additional licenses. If you are buying it for more than one client you can just buy an additional license without setting up another account.
Posted in: F.A.Q