No Linux download :-(
Nevertheless it's fairly easy to install[1]. If you have docker, you can just run the image to try it out:
docker run -p 8080:8080 -p 8081:8081 --pull always livebook/livebook
You may want to configure some things, so check out the options[2].:If you want a "native" install, after you have elixir installed you can use
mix escript.install hex livebook
and start it with livebook server
Check out the readme for more configuration options[1]