For version 1.52 of Pvoc Kit, 1.51 of Spectral Shapers and 8.03 of Delay Trio/Freesound, Windows VST plugins are installed in C:\Program Files (x86)\Steinberg\Vstplugins and C:\Program Files\Common Files\VST2.
This is no longer the case for version 1.52 of Spectral Shapers