Hi - I am a bit confused.
Your signature indicates you are running X3a, but you seem to be using Command Center, which comes with the new release that just came out, to look for Rapture and Dim Pro, etc.
Can you please clarify what you have installed?
IF you are running X3a, you can go to the Cakewalk support by product page, and use the drop-down boxes to pick Sonar X3, and it will open a list of available updates for whatever flavor it it you have.
There will also be installation instructions for getting everything installed. If you follow the instructions, you will have an installer for Sonar, and Rapture, and another for Dimension Pro, as well as its expansion packs.
I am also not sure why anything you have is looking for those, unless you have them specified within projects. I have never had them 'not' installed, so if there is some weird behavior going on, I would never have experienced it.
Bob Bone