a. Install your downloaded mod into a separate directory (for example D:\GP4_2016) b. start CSM, select "Extra Stuff" on the left side, select your directory where it says "GP4 installation to create mod from" and press "Build"
By the way, where did you get a 2016 mod from?
My personal GP4 files at : www.4shared.com ______ My Blog at : Gitanes GP4 work * Performance Files * LoadingScreens GoogleMaps * GP4 Tracks and Cars Databases
The link works, I guess he means converting it in a CSM mod, but to do what gitanes said you need a full installation of gp4, and the link only contains a cars.wad, a physics and a teameditor file.