Fallout 4 Downgrader Script for Debian 12. Make sure to disable updates, a guide for which can be found here: https://www.youtube.com/watch?v=rxwPNCPz4r8

Fallout4Downgrader.sh

if ! command -v steamcmd &> /dev/null
then
	# Install SteamCMD
	echo "SteamCMD was not found, installing..."
	sudo update
	sudo apt install software-properties-common;
	sudo echo "deb http://ftp.us.debian.org/debian bookworm main non-free" > /etc/apt/sources.list.d/non-free.list
	sudo dpkg --add-architecture i386;
	sudo apt update
	sudo apt install steamcmd
	echo "SteamCMD install complete, attempting downgrade."
fi


# Login to SteamCMD
echo "You will have to login to Steam via SteamCMD to start the downgrading process."
echo "What is your username on Steam?"
read USERNAME

# Download the depots to downgrade the game
steamcmd +login $USERNAME +download_depot 377160 377162 5847529232406005096 +download_depot 377160 377161 7497069378349273908 +download_depot 377160 377163 5819088023757897745 +download_depot 377160 377164 2178106366609958945 +download_depot 377160 435870 1691678129192680960 +download_depot 377160 435871 5106118861901111234 +download_depot 377160 435880 1255562923187931216 +quit