New user Hello and some serial key help

Hi, new to Cross and love it just moved from the trial version to full bought on the Mac app store. Is there a way to get the serial number, I need to move back to my laptop as I'm having some dramas with Macbook. I'll post another full thread on the issues to see if some one can help. Basically distorted sound I keep pushing the latency up further and further but it keeps happening even all the way up 45 it just buys me time till it happens again.
I use a Macbook pro2,2 2.33 core duo, 3gb with two Denon Sc2900s and a DN-X1500 mixer.

I use a Macbook pro2,2 2.33 core duo, 3gb with two Denon Sc2900s and a DN-X1500 mixer.
