Except for Boost11 (which is installed by the main Sonar installer), all other plugins are installed to the folders you set in the options for CCC (click on the cog button for the options).
The following VST DLLs have file dates from May 2015, so those should have been updated: Channel Tools, Percussion Strip, Vocal Strip, Tube Leveler, Transient Shaper.
Even for packages you have not installed by CCC, you can see the version number in CCC to find out if there was an update or not. But you must know the initial version numbers (which were 1.0.0.7 for all Cakewalk VST packages).