Same problem here. Bought 2 days ago because my Sonar Pro only launches in Demo mode.
The website at Cakewalk for activating Home Studio said "Offer Expired". I emailed my activation code to the Activation Support at Sonar but didn't receive an answer yet. Home Studio isn't present in my CCC.
Well it's been xmas and new years eve and things are probably pretty chaotic at Cakewalk atm, so maybe we need to wait a bit longer, I don't know. :(