It is pretty old… If you look at the most recent comment, it doesn’t work and has errors with Unity 5. A pretty good series is available on the new Unity UNet networking. If you look around, you can also find more up to date tutorials for Forge, PUN, Bolt, and other networking solutions. Probably best to stick with videos from 2015 at the earliest or you may end up dealing with trying to figure out why things that used to work don’t work now.