[PUN2] Most current docs?

I'm new to Photon but not to networking in general. I want to test Photons performance and capabilities for real time games.

Looking at the docs https://doc.photonengine.com/en-us/realtime/current/getting-started/realtime-intro

The first line "using ExitGames.Client.Photon.LoadBalancing;" gives me an error.
Assets/Scripts/Main.cs(9,31): error CS0234: The type or namespace name `LoadBalancing' does not exist in the namespace `ExitGames.Client.Photon'. Are you missing an assembly reference?

Are there any official docs that work?

I also tried getting the Asteriods game to work but it doesn't go any further than to the screen saying "Waiting for other players" when testing with two players.