Run these commands in TTY shell or a Terminal
sudo download https://gist.github.com/Austcool-Walker/03a8838efaeb8237304f6f032d4bef50/raw/d446ba26cc6ca9f1f4557f907ca5c7aa26c27078/notifyosd.zsh /usr/local/share/zsh/site-functions/notifyosd.zsh
Or
sudo curl -o /usr/local/share/zsh/site-functions/notifyosd.zsh https://gist.github.com/Austcool-Walker/03a8838efaeb8237304f6f032d4bef50/raw/d446ba26cc6ca9f1f4557f907ca5c7aa26c27078/notifyosd.zsh