When in Cakewalk Plugin Manager, click on 'Options', [middle - lower down].
This will bring up a window that shows which VST folders have been already scanned.
You may need to add one to find your '32s'.
It may be something like:
C:\Program Files (x86)\VstPlugins\.
or
C:\Program Files (x86)\Steinberg\VstPlugins\.
I always go looking for them first & make note of where they are so I don't have to guess.
In a 64 bit system, there will typically be a folder like the ones above for all things '32 bit'. [That's what the (x86) means].
Your 64 Bit stuff, on the other hand, will most likely be in:
C:\Program Files\Vstplugins\.
It could also be:
C:\Program Files\Steinberg\Vstplugins\. [Notice no (x86).]
After you add the path, & click 'Ok', you should click 'Scan Vst Plugins' to the right of 'Options'
I then seem to have to close then re-open Sonar to have the changes take effect.
Finally, back in Cakewalk Plugin Manager, you may have to highlight & 'Add Plugin' to the list on the right if they don't show up on their own.