From what I can understand CbB is the core program of Platinum, not sure what instruments are included if any.
To get access to the likes of Dim Pro, Rapture, Rapture Pro, Z3ta+2(which were separate purchases) you would need to run their respective installers. This could be through CCC or if you still have the original installers in the CCC download directory. If you do not have them I would highly recommend downloading them from your old Cakewalk account or through the CCC.
Any third party plugins are no longer licensed i.e. AAS, True pianos, Bluetube, etc. However if they are installed on your system they still work you just need to add their paths to the VST scanner.