None of the examples are good.

[blindxfish]

TwitchApiExample - api doesn't contains either models, users channels..

I mean the baseline would be to have a basic decent readme at least with a howto install.

[swiftyspiffy]

Being honest, there's no owner for this package. It's a sort of best effort porting of TwitchLib into something that is sort of usable in a Unity environment.
If this library isn't working, consider using the official Twitch SDK for Unity here: https://dev.twitch.tv/docs/game-engine-plugins/unity-guide/