I couldn't find any part I might of missed in the instructions, but I did see the part about downgrading to 126.96.36.199, but when I looked at that, I couldn't figure out how to get the Console tab to show up on my Steam to downgrade it.
I tried to download the mod, but I keep getting this error when it tries to open up and play:
System.NullReferenceException: Object reference not set to an instance of an object.
at Terraria.Main.DrawMenu(GameTime gameTime)
at Terraria.Main.Draw(GameTime gameTime)