GTA5-Mods.com'a hos geldiniz

I don't know how to correctly install it, after putting the files into the correct directory, and after that starting the game, there's the normal GTA V Launcher, but it has to download somes stuff and then it's simply gone and I don't know how I would get the Springfield in-game. I don't know, if I'm just stupid but I need some help here
pls :'(

I don't the Readme, what am I supposed to do here??