I just purchased a new mac. I must not have deactivated my old mac before erasing the HDD. How do I go about deactivating it so I can install parallels desktop 11 (10 with upgrade to 11) on my mac without the error message? i do have my activation code for 10 and 11 Error Message: You have reached the maximum number of activations available for your activation key (http://www.parallels.com/eula). Please purchase a new product license. Thanks in advance!