so you just want to run this command:
bash <(curl -s https://raw.githubusercontent.com/hpcodecraft/Gameshell/master/retroarch/setup.sh)
that will download a setup script for you.
after that, you may have to set executable permissions on that file. to do that, use this command:
sudo chmod +x setup.sh
once that is done, you can run the setup script like so:
then the thing should just run and uhhhh you’ll be good to go. could take a while to compile everything. iirc i had to leave mine download/compiling for 15 minutes… maybe more?