"does not appear to be a valid os installer application" However, when kicking off the install it quickly fails with the following error message: After following this process I picked up in your tutorial and the ISO booted. The answer suggests created a "SharedSupport" folder in the Catalina installer and then copying the files from the "macOS Install Data" directory, then create an ISO. The stub will download several files to "/macOS Install Data". In the above answer, you have to initiate the Catalina install stub, but stop it before the machine has a chance to reboot. I used varying resources, this one got me the closest: "" This sent me on a rabbit trail to either download a full copy of Catalina or build and ISO from scratch. "/Applications/Install macOS Catalina.app does not appear to be a valid OS installer application." "sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia -volume /Volumes/install_build" Namely when the following command is run: The solution you provide in this blog post seems to be lacking.
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