Quixel Bridge not installing to v4

I have Unreal versions 4.25, 4.26, 4.27, and 5 in my library, and am trying to install quixel bridge. When I installed bridge to engine in the launcher vault, it looks like it only installed to 5 when checking installed plugins. When I click install to engine again, it says ‘you cannot install this plugin as it is already installed to all compatible engines.’ I can confirm that it is installed in plugins for v5 but not 4. How do I install quixel bridge to version 4?