How can I buy djay 4 and NOT djay pro?

My macbook pro is old and is not compatible with djay pro. How can I buy djay 4? I lost/never received my license key from djay 4 so I want to just purchase it again.

Hi Dave, 

thank you very much for contacting us!
I just send you a mail with a dl-link and your personal license key!Best regards,