keep reading, if it is a download
http://forum.cakewalk.com/FindPost/3147803The purchase of physical media upgrades from retailers has not been discussed but I would guess there is a redemption code used to activate physical media upgrades now or it may still use the old registration process (my money is on a redemption code though).
IOW, for the clock to start, there has to be some action associating your Cakewalk account to the purchase. There is no automatic update to your Cakewalk account for purchases made from retailers.