hello! I'm trying to install itgmania on bazzite, but the installer doesn't seem to work for readonl

hello! I'm trying to install itgmania on bazzite, but the installer doesn't seem to work for readonly systems. This is the setup.sh file:

#!/bin/sh
set -eu

if [ "$(id -u)" -ne 0 ]; then
    echo 'root privileges required' >&2
    exit 1
fi

copy_sl_config() {
    if [ -d "/opt/itgmania/Themes/Simply Love.old/$1" ]; then
        # Don't overwrite any existing files.
        # This lets us retain the updated readmes and other files that come with the new release.
        cp -r -n "/opt/itgmania/Themes/Simply Love.old/$1" "/opt/itgmania/Themes/Simply Love/$1"
        return
    elif [ -f "/opt/itgmania/Themes/Simply Love.old/$1" ]; then
        cp "/opt/itgmania/Themes/Simply Love.old/$1" "/opt/itgmania/Themes/Simply Love/$1"
    fi
}

cd "$(dirname "$0")"

# Move the old SL release out of the way
[ -d /opt/itgmania/Themes/Simply\ Love ] && mv /opt/itgmania/Themes/Simply\ Love{,.old}

# Install ITGm
[ -d /opt ] || install -d -m 755 -o root -g root /opt
cp -R --preserve=mode,timestamps itgmania /opt
ln -sf /opt/itgmania/itgmania.desktop /usr/share/applications

# Copy persistent files over from the old SL folder
if [ -d /opt/itgmania/Themes/Simply\ Love.old ]; then
    copy_sl_config Other/SongManager\ PreferredCourses.txt
    copy_sl_config Other/SongManager\ PreferredSongs.txt
    copy_sl_config Modules

    rm -rf /opt/itgmania/Themes/Simply\ Love.old
fi


any tips?
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