I've downloaded the X3 installer, about an hour ago. Now I'm waiting for my serial# and reg codes to show up in the Cakewalk store.
It said they'd show up within 15 minutes / 45 minutes (depending on whether you read the email or the web page) but so far, no joy.
Is there a known delay in having the numbers show up?

Mine have still not arrived. It's been over an hour.

Still got a couple of hours downloading to go, but the codes are there. I am no sure how long it took, but they were there when i checked around an hour after ordering.

The reg servers are probably getting slammed right now and due to the store load, registrations haven't been able to merge.
 
They update soon but send Ryan a PM if you don't see anything in 30mins-hour.

OK, thanks Seth!