Get-InstallAssistant-pkg-links-from-Apple.sh

#!/bin/zsh
#Get Big Sur, Monterey & Ventura InstallAssistant.pkg links from Apple
#For macOS 11 (Big Sur), 12 (Monterey) and 13 (Ventura), Apple provides the Install macOS ___.app packaged as InstallAssistant.pkg
#The links for the InstallAssistant packages are listed in the seed catalogs
#The seed catalogs are listed in /System/Library/PrivateFrameworks/Seeding.framework/Versions/A/Resources/SeedCatalogs.plist
#The script gets the CustomerSeed seed catalog link from SeedCatalogs.plist, then gets the macOS versions available from the Info.plist and prints the links for the corresponding InstallAssistant.pkg
#Other options
#PublicSeed (Public Beta)
#link=$( plutil -p /System/Library/PrivateFrameworks/Seeding.framework/Resources/SeedCatalogs.plist | grep 'PublicSeed' | sed -e s/'"PublicSeed" => "'//g -e s/'.gz"'//g -e s/\ //g )
#DeveloperSeed (Developer Beta)
#link=$( plutil -p /System/Library/PrivateFrameworks/Seeding.framework/Resources/SeedCatalogs.plist | grep 'DeveloperSeed' | sed -e s/'"DeveloperSeed" => "'//g -e s/'.gz"'//g -e s/\ //g )


link=$( plutil -p /System/Library/PrivateFrameworks/Seeding.framework/Resources/SeedCatalogs.plist | grep 'CustomerSeed' | sed -e s/'"CustomerSeed" => "'//g -e s/'.gz"'//g -e s/\ //g )

for file in $(curl -# $link | grep Info.plist | grep -Evw '(Info.plist.integrityDataV1|InstallInfo.plist)' | sed -e s/"<string>"//g -e s/"<\/string>"//g -e s/\ //g); do
    curl -# $file | egrep -EA 1 '(>Build<|OSVersion)' | sed -e s/"<string>"//g -e s/"<\/string>"//g -e s/\ //g | sed -e s/"<key>"//g -e s/"<\/key>"//g -e s/\ //g
    echo $file | sed -e "s/Info.plist/InstallAssistant.pkg/g"
done

How to use the script
https://user-images.githubusercontent.com/26733455/227010810-a4b18caa-e8c9-4720-8a47-02c00be05219.mp4