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We are attempting to create a policy in self service that performs an upgrade. We use the macOSUpgrade.sh. After downloading the needed files, we get a "We were unable to prepare your computer for macOS Catalina: error (see attached). Our machines are FileVaulted. Not sure what's going on. It does not do this every time... even on the same machine.

@rpayne have you tried updating your install macOS catalina.app ?


I JUST did. It's 10.15.5.02


How are you calling the .app? Dropping it in /Applications ? Have you also modified the script with that version?


Hi @rpayne,
By default, the main log (most complete) is located:



osinstallLogfile="/var/log/startosinstall.log"


You may also be able to find the reason for the error within Jamf's policy log history.



Happy to help if you can provide a little more info about what error you're getting.


@mack525 I'm dropping it in the applications folder and using a custom trigger per the macOSUpgrade.sh. I have modified the script to reflect the current 10.15.5.02 (also tried the current installer version 15.5.02)


I'm an idiot. Putting it to 10.15.5 (even the CURRENT is 10.15.5.02) works.


@rpayne it’s always 1 simple step that screws things up. Good hear it’s working