System install path
The typically read-only path used when
installing plugins using legacy packages. Examples includes /usr on
linux, C:\Program Files (x86) on windows and /Applications on macos.
User install path
The r/w path used to install plugins. Examples
includes ~/.local on linux, ~/Library/Applications on macos and
%LOCALAPPDATA% or %HOME%\Appdata\Local on windows. See
Installation paths