El código de licencia de prueba para rhino no me funciona

Me podrían ayudar, el código de prueba para utilizar rhino 7, no me funciona ya van dos veces que lo intento con cuentas diferentes y no me funciona. AYUDA!

Your evaluation period ended yesterday. Each person is granted one evaluation period of 90 days, after which you need to buy a valid license if you have need to use Rhino longer. You are trying to circumvent the evaluation license limit, which is not allowed.

Please visit Rhino - Buy - Rhinoceros to acquire a full license. Note that as a student you could be eligable for a big discount of up to 80%. Check the buy page for more information.