There are 2 methods of running the script in general.
Either:
curl -O https://raw.githubusercontent.com/overkillwtf/folon-steamdeck-installer/main/fallout.sh && \
chmod +x fallout.sh && \
./fallout.sh

Or:
bash <(curl -s https://raw.githubusercontent.com/overkillwtf/folon-steamdeck-installer/main/fallout.sh)

Additional Commands (Update Disablers, Explained in video):

Fallout 4 installed on SSD:
Enable Updates:
sudo chattr -i "$HOME/.steam/steam/steamapps/appmanifest_377160.acf"

Disable Updates:
sudo chattr +i "$HOME/.steam/steam/steamapps/appmanifest_377160.acf"

Fallout 4 installed on SD Card:
Enable Updates:
sudo chattr -i "/run/media/mmcblk0p1/steamapps/appmanifest_377160.acf"

Disable Updates:
sudo chattr +i "/run/media/mmcblk0p1/steamapps/appmanifest_377160.acf"