Just to doubly (triply?) confirm. I did exactly what tbosco did, trying to install Rapture only, except for itss being the x64 version in my case, and I got the same exact result, including the message about DimPro (even though I wasn't installing that), and no Rapture.
I might note that I also saw a message along the way that it was putting some Rapture setup files somewhere under C:. If it did, though, I did not find them in a quick look around the obvious places.
Also, as a P.S. to my earlier note, for anyone who is interested, the thread I alluded to that I'd write about the other installation problem I had due to short space on my C: drive is now posted at
http://forum.cakewalk.com/tm.aspx?m=2668496.
Rick