You will need to contact support if you no longer have access to the computer on which one of your activations currently resides. They will be able to release that activation for you, so that you can reuse it on your replacement computer.
You will need to contact support if you no longer have access to the computer on which one of your activations currently resides. They will be able to release that activation for you, so that you can reuse it on your replacement computer.