Command Center does not interrogate the PC for products already installed. It relies on data stored in the Command Center folders about what it has installed.
SONAR knows about installed products because it relies on the VST scanner to build an inventory of installed products based on the VST scan path provided.
The DimPro and Rapture packages have not changed in years. I would expect additions would show up as extra packages much like the extra content of the past. Similar to the Content Club if you had X2.
Melodyne relies on Celemony for updates. The program handles updates differently than Cakewalk products. The update tool is built into the Melodyne software itself
That said, this is the initial release of Command Center.