I'm looking for a MInecraft client?

I saw a guy on YouTube, he had one

Minecraft client.

Minecraft sometimes says "Failed to Log-IN (Try resrarting you game)"

You always have to restart your MC

If you click on multiplayer there was a button "Create new session"

and then you could join on it

Does anyone know the name of the client or whether it still exists?

Maybe you just mean Windows Minecraft Launcher.

What does your client currently look like?

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My Minecraft channel:
https://www.youtube.com/...o0CAN7RnEA