License not recognised when trying to re-install

recently had problems with the hdd on my Macbook Pro, installed new hdd and re-installed all my apps however when trying to re-install DJAY i get the message

The license key you entered is incorrect
Please make sure to enter the license key as provided in your email receipt or on your CD sleeve.

The license i entered is the same as on the cd sleeve and the same as in the registration confirmation email.

How can i get past this problem ?