In order to uninstall our plugins, you will need to delete the plugin file from their folders:
WIN
C:\Program Files\Steinberg\VstPlugins
C:\Program Files\Common Files\VST3\
C:\Program Files\Common Files\Avid\Audio\Plug-Ins
C:\Program Files\Common Files\Digidesign\DAE\Plug-Ins
MAC
/Library/Application Support/Avid/Audio/Plug-Ins
/Library/Application Support/Digidesign/Plug-Ins
/Library/Audio/Plug-Ins/Components
/Library/Audio/Plug-Ins/VST3
/Library/Audio/Plug-Ins/VST
Then, in each folder, find the plugin that you want to uninstall, and move it to the Trash.
(Note that if you are using a custom VST folder, you will need to also trash the plugin files from that location as well.)