Game Porting Installer Won't Start

I am installing Homebrew and GPTk according to this video: https://www.youtube.com/watch?v=WdQIc69e5oA

I have Homebrew installed. When i type in

which brew 

it responds with

/opt/homebrew/bin/brew

When I enter the command

brew -v install apple/apple/game-porting-toolkit

it replies with

HomeBrew 4. 2. 21

Anyone know who to get the game porting kit to install? I have tried download both of the options (kit v1 and v1.1) from the website but it doesn't make a difference

Option '-v' stands for --version. Try to enter command without it: brew install apple/apple/game-porting-toolkit

Game Porting Installer Won't Start
 
 
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