Went to the App Store and downloaded Catalina, and it asked me if I want to download the whole thing, and it did. I got it by trial and error: I had a Mojave VM just freshly installed. Maat 3:37 turns out yesterday I was able to get the ~8.2 GB FULL Catalina installer (aka "/Applications/Install macOS Catalina.app") from the App Store, NOT the limited 19 MB one. I'm curious for those who found success, where did you get the Catalina installer that already has the SharedSupport folder with all the necessary files? "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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