macOS Patch Package Creation

@KMerendaTFMC You really don't want to try and push the full OS install as an update, or the updater for that matter as the only reliable way to get the the security and delta updates to apply these days is via System Preferences->Software Update. If you want to deploy the full OS installer for users to run via Self Service, macOSUpgrade is a popular option.

@KMerendaTFMC have a look at https://www.jamf.com/blog/reinstall-a-clean-macos-with-one-button/
See the last code example to call the startosinstall script '/Applications/Install macOS Catalina.app/Contents/Resources/startosinstall' --agreetolicense --forcequitapps

Patch management will only accept a package not a script. You will need to make a payload free .pkg with a postinstall.sh that calls the Installer .app with the "startosinstall" command. At its core, that's all you need.

There are several different scripts that will give you more control, like checking free space and if the device is plugged in, and some that will even download the installer for you. Check out: https://github.com/kc9wwh/macOSUpgrade

@ega Thanks! I was familiar with that article and I have the clean install policies setup, but I was hoping to do it via patch management. I'm not sure how to get the .pkg to call the startosinstall

@KMerendaTFMC Just use composer to create a postinstall script with that command. I attached an image of the simplest script.

Keep in mind that startosinstall requires a logged in user