Can't even Start Client of Legends of Runeterra

I got a Mail that said i can Download and Play LoR. I downloaded the installer and started it. It did a short time something, then it vanished and nothing more happened. No Icon on the desktop, no autostart of a launcher. I now just have a new File called "Riot Client" and i cant to anything with it. If i open the file i just see a bunch of things i cant do anything with. What do i have to do?
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