How do you install mods

This is the only (?) guide that is sure to work.
http://www.beamng.com/threads/12872-Guide-to-mod-installation-for-0-4-0-0-and-up

Again, read it very carefully. There are old mods that have a different installation method, and that guide explains exactly, step by step, how to deal with them.
Everybody installs mods using that method, so if it doesn't work, check your steps, you may have done something wrong somewhere.

 

It's the 'Unknown' thing.
There is currently an incompatibility with old mods in the current version.
The mods would need to be updated from their author.
It's possible that a fallback solution is found from the devs, but no ETA/Promises on that.

 

NO. No mods have to be installed in the game folder, absolutely. They will end up getting wiped at each update.
I already gave all the information needed above anyway too..

 

But you aren't using the latest version? I don't see BeamNG.Drive in your game library (I checked the Steam account you linked). How's that?

 

You don't know if you have BeamNG.Drive on your Steam account? That's a new for me.