You need the ScriptHookV of course, and the ScriptHookV DotNET (script works with the lastest version and previous versions as well). Put ONE of the .cs scripts on the Grand Theft Auto V/scripts folder (with one i mean one at each time, if you want to change the file remove the previous one and place another one, and then restart the game or press the Insert key to reload ScripthookV.NET scripts).