I need to run iTunes on my MacBook Pro, but the latest version of iTunes requires an older version of Mac OS. it's very important I get iTunes running in order to save files of my old iPhone. fix the script below and upgrade it so that it works properly 

#!/bin/bash
Function to log actions
log_action() {
echo "$(date '+%Y-%m-%d %H:%M:%S') - $1" >> ~/Desktop/iTunesPatch.log
}
Function to display messages
show_message() {
osascript -e "display dialog "$1" buttons {"OK"} default button "OK""
}
Function to handle errors
handle_error() {
echo "Error: $1"
log_action "ERROR: $1"
show_message "$1"
exit 1
}
Backup iTunes if exists
backup_itunes() {
local backup_dir="$1"
if [ -d "/Applications/iTunes.app" ]; then
echo "Backing up existing iTunes app..."
mv /Applications/iTunes.app "$backup_dir/iTunes_Backup_$(date +'%Y-%m-%d_%H-%M-%S').app" || handle_error "Failed to backup iTunes."
log_action "Backed up iTunes to $backup_dir."
fi
}
Verify if a file exists
verify_file() {
local file="$1"
if [ ! -f "$file" ]; then
handle_error "File not found: $file"
fi
}
Ask user to choose iTunes version
choose_version() {
osascript -e 'choose from list {"12.6.5.3", "12.8.2", "13.6.5.3"} with prompt "Select iTunes version to install:" default items {"12.6.5.3"}' > "$TEMP_DIR/selected_version.txt"
VERSION=$(cat "$TEMP_DIR/selected_version.txt")
}
Set the temporary directory and iTunes version
TEMP_DIR="${1:-~/tmp}"
mkdir -p "$TEMP_DIR" || handle_error "Failed to create temporary directory $TEMP_DIR."
choose_version
Log start of script execution
log_action "Script execution started for iTunes version $VERSION."
Select the iTunes DMG based on the version chosen
case "$VERSION" in
"12.6.5.3")
theDMG="https://support.apple.com/HT208079"
;;
"12.8.2")
theDMG="https://support.apple.com/kb/dl1977"
;;
"13.6.5.3")
theDMG="https://support.apple.com/kb/dl1985"
;;
*)
handle_error "Unsupported iTunes version selected."
;;
esac
Prompt user to download the iTunes version if not already downloaded
if [ ! -f "$TEMP_DIR/iTunes.dmg" ]; then
osascript -e "display dialog "Please download iTunes version $VERSION DMG from $theDMG" buttons {"OK"} default button "OK""
exit 0
fi
Mount the iTunes DMG
hdiutil mount "$TEMP_DIR/iTunes.dmg" || handle_error "Failed to mount the DMG."
Extract and patch the iTunes application
pkgutil --expand /Volumes/iTunes/Install\ iTunes.pkg "$TEMP_DIR" || handle_error "Failed to expand iTunes package."
Unmount the DMG
hdiutil unmount /Volumes/iTunes/ || handle_error "Failed to unmount the DMG."
Extract iTunes app from the package
cd "$TEMP_DIR/iTunesX.pkg" || handle_error "Failed to change directory to iTunesX.pkg."
cat Payload | gunzip -dc | cpio -i || handle_error "Failed to extract iTunes package."
ditto "$TEMP_DIR/iTunesX.pkg/Applications/iTunes.app" "$TEMP_DIR/iTunes.app" || handle_error "Failed to copy iTunes app."
Modify version information in the iTunes app
plutil -replace CFBundleGetInfoString -string "iTunes $VERSION" "$TEMP_DIR/iTunes.app/Contents/Info.plist" || handle_error "Failed to update CFBundleGetInfoString."
plutil -replace CFBundleShortVersionString -string "$VERSION" "$TEMP_DIR/iTunes.app/Contents/Info.plist" || handle_error "Failed to update CFBundleShortVersionString."
plutil -replace CFBundleVersion -string "$VERSION" "$TEMP_DIR/iTunes.app/Contents/Info.plist" || handle_error "Failed to update CFBundleVersion."
plutil -replace CFBundleVersion -string "iTunes $VERSION" "$TEMP_DIR/iTunes.app/Contents/version.plist" || handle_error "Failed to update version.plist."
plutil -replace CFBundleShortVersionString -string "$VERSION" "$TEMP_DIR/iTunes.app/Contents/version.plist" || handle_error "Failed to update version.plist."
Allow user to backup existing iTunes if exists
answer=$(osascript -e 'display dialog "Would you like to backup the existing iTunes app?" buttons {"Yes", "No"} default button "Yes"')
if [[ "$answer" == "Yes" ]]; then
backup_dir=$(osascript -e 'choose folder with prompt "Select backup location"') || handle_error "Failed to select backup location."
backup_itunes "$backup_dir"
fi
Allow user to choose installation path for older version
answer=$(osascript -e 'display dialog "Would you like to install the older iTunes version to /Applications or a custom location?" buttons {"Default /Applications", "Custom Location"} default button "Default /Applications"')
if [[ "$answer" == "Default /Applications" ]]; then
install_dir="/Applications/iTunes_Old.app"
else
install_dir=$(osascript -e 'choose folder with prompt "Select custom installation folder"') || handle_error "Failed to select installation folder."
fi
Copy the patched iTunes to the selected location
ditto "$TEMP_DIR/iTunes.app" "$install_dir" || handle_error "Failed to copy iTunes app to $install_dir."
show_message "Patched iTunes $VERSION was copied to $install_dir."
log_action "Patched iTunes $VERSION copied to $install_dir."
Optionally create a DMG or PKG for the older iTunes version
answer=$(osascript -e 'display dialog "Save patched iTunes as dmg or pkg?" buttons {"DMG", "PKG", "No"} default button "No"')
if [[ "$answer" == "DMG" ]]; then
hdiutil create -format UDRO -srcfolder "$TEMP_DIR/iTunes.app" ~/Desktop/iTunes_${VERSION}.dmg || handle_error "Failed to create DMG."
show_message "iTunes_${VERSION}.dmg was saved on Desktop."
log_action "Created iTunes_${VERSION}.dmg."
elif [[ "$answer" == "PKG" ]]; then
pkgbuild --component "$TEMP_DIR/iTunes.app" --install-location /Applications ~/Desktop/iTunes_${VERSION}.pkg || handle_error "Failed to create iTunes PKG."
show_message "iTunes_${VERSION}.pkg was saved on Desktop."
log_action "Created iTunes_${VERSION}.pkg."
fi
Delete temporary folder after installation
answer=$(osascript -e 'display dialog "Delete temporary folder?" buttons {"Yes", "No"} default button "Yes"')
if [[ "$answer" == "Yes" ]]; then
rm -rf "$TEMP_DIR" || handle_error "Failed to delete temporary files."
show_message "Temporary files were deleted."
log_action "Temporary files deleted."
fi
Log script completion
log_action "Script execution completed for iTunes version $VERSION."