When I launch Rapture/Dimension Pro I get a pop-up saying I need to enter the "registration code". But when I do,  I get an error message saying it's an "invalid code".
The link on the pop-up takes me to the reg page (here on the CW site) where Cakewalk tells me I don't have to register a registered product...
I even tried C&P-ing it from the "my account" page & entering that into the infernal pop-up... It still errors out with the "invalid" code flag...
Every time I launch them, they want that blasted code. 
What should I do? 

Try running the stand alone versions as administrator (right-click the program name or icon and select "run as administrator" from the context menu)  to register the programs.

BINGO!!!!!!!
Many thanks,
For being rite rapid, and for nailing it!
-R-

This has been a common situation for as long as I can recall, and lots and lots of folks run into it (myself included).
 
Glad you are sorted out.
 
Bob Bone