I'm not 100% for sure as I've never done this before, but I think you go to
http://helpx.adobe.com/x-productkb/policy-pricing/upgrade-policy-product-an... and submit your info.
Tim
Tim
Apple XRAID, XServe, MacPro, Macbook Pro, XSAN, FCP Studio (7), AVID Media Composer
Apple Monitors, Flanders Scientific Broadcast, Panasonic AG-AF100
Adobe Production Premium, Maxon Cinema 4d
Beer fridge fully loaded.