Hi i had just had a change of laptop and have gone from windows to apple mac. I downloaded the native instruments access. But my tractor scratch software in not there. So i tried to enter my serial number but the last 4 number are worn out?. How do i get the software for my mac without having to buy software again. i have the box and all the bar codes, but a worn out serial number. Please how do i resolve this, i just want to download the software to my new laptop.