I don't know to which topic i should respond so i choose this one.
I'm havig problem activating my licence. It says that my serial number is not valid.
It was probably upgraded and/or the Subscription has lapsed. You will either need to contact your reseller or perhaps philip.s on the boards here will spot you.
I can definitely check validate the license if you could send me a Private Message (click on my philip.s profile name and then "Send this user a private message") with the serial number. Another option is to contact our License Assistance team directly for additional support.