I know I have the page how to install mods but I wanted to install one manually but I can not. And it does not appear when I put it in the mods folder. Did i do something wrong? I even compact the mod folder but I still can not install it. Or can not install mods outside of the mods repository?
Look for manual method on this manual page: https://wiki.beamng.com/index.php?title=How_to_install_mods&redirect=no