Autoupgrade is compatible with 12.2 and 18.5 and you need to download the kit from 2485457.1
Autoupgrade.jar is available default in 19c
How this works
Prevent Issues : Analyze and Fixup Modes
java -jar autoupgrade.jar -config config.txt -mode analyze
java -jar autoupgrade.jar -config config.txt -mode fixups
Simplifying Upgrade: Deploy and upgrade
java -jar autoupgrade.jar -config config.txt -mode deploy/upgrade
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