I think they updated a lot of stuff since this thread. The offline process is now well documented and I had no problems downloading and installing Producer the good old fashioned way on a Laptop I just fixed up. No Command Centre was used.
I just downloaded all the files that where in my account folder. I actually tried to install CC but it said I needed Net Framework 4 and my OS said I already have it installed?? so was a stalemate. So I installed Producer without CC no problem. When you open Sonar for the first time ( do as administrator) there will be a few blue dialogue boxes in the lower right corner. One say's Demo Mode, One of them asks if you want to activate off line and when you click on it, it takes you to your account page ( you must be still on line duh! ) and gives clear instructions on how to proceed. It's an offline activation file you can move to any other computer, or in this case, the same computer sans CC. The export/ import offline activation is found in the HELP menu of Sonar.
I worked for a few hours last night after installing all my stuff like Dim Pro and AD 2. All is working perfectly and all without the presents of Command Centre.
So when I get home I will transfer the new version of Professional over to my main DAW and install it over the old version. Or I might try the folder trick mentioned above first. But I'm tempted to scrap Command Centre if it's not really needed for the way I do things. Every time there's an update it's pretty obvious if you visit the forum :) I'm not really keen on the additional content stuff at this point but will keep an eye on that too.