https://steamcommunity.com/app/353380/discussions/0/1743353164093954254/
To install, run the following from a command line:
curl -#Of http://media.steampowered.com/steamlink/rpi/steamlink_1.0.3_armhf.deb sudo dpkg -i steamlink_1.0.3_armhf.deb
To run, you can launch it from the Games menu, or run the following from a command line:
steamlink
The first time you run it, it will download the full app and create a desktop shortcut, and automatically update as needed.