Open the downloaded zip file using WinRAR or 7zip etc. . Find “Documents/[acf field="requiredgame"]/mod” directory on your computer. Drag the file with “SCS” extension from the zip file to the mod folder you find. Enter the [acf field="requiredgame"] and activate this mod from the Mod Manager located in Profiles screen. Exit the mod manager and start the game. Enjoy the mod!