If you encounter the "zsh: command not found: gameportingtoolkit" error, it's because the terminal isn't recognizing the 'gpt' file globally. To address this, either move all three files to /usr/local/bin and then call it with 'gameportingtoolkit' (you might need to restart the terminal), or place it in a specific directory and use its full path, such as '~/gameportingtoolkit' for the home directory.