HOW DO I GET THE CODE? (Upgrade från CS 5.5 to 6.0)

I am tryingto install AdobeCS6 on my computer. The installationgoesfine until I enter my serialnumber. Then I getthe message "The serial number is valid, butcould notfinda qualifying producton this computer." When I searchonthe AdobesiteI find information abouta new installationprocess. It says thatIno longer needa serialnumberbuta code.The question isHOW DO I GET THE CODE?

The only thing Igotonmy purchaseis our 7licenses (volume licenses) is1order number and 7serial numbers.