How do I uninstall a plug-in?

macOS:

Remove the plug-ins from these three directories:

AAX: Macintosh HD/Library/Application Support/Avid/Audio/Plug-Ins/
AU: Macintosh HD/Library/Audio/Plug-Ins/Components/
VST3: Macintosh HD/Library/Audio/Plug-Ins/VST3/

- Make sure you're navigating to the system library and not the user library inside your home folder.
To get to the right library, use the Command+Shift+G command in the Finder to open the Go To modal, and type in
/Library

Windows

Uninstall the software using Windows' Add or Remove Programs / Apps & Features control panel.