You need to locate the actual path to wherever those missing plugins live, and then make sure that the path to those is present (or add it) in the Cakewalk Plugin Manager VST Options Scan Paths.
Then it should automatically find those and make those available to Sonar.
I am thinking they didn't get installed to any of the folders currently in the scanning path that the Plugin Manager has at this time - so by making sure that the actual path to the actual location of those plugins gets added to Plugin Manager.
Bob Bone