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I've just got my new Mac computer which came preinstalled with Catalina. To use 32 bit programs, I'm trying to use a bootable install in order to downgrade to Mojave, which I've done before.

I followed the instructions provided on this site: https://www.imore.com/how-make-bootable-installer-drive-downgrade. I also went into recovery mode to access Startup Security Utility to enable bootable installs. In the final step of holding down Option while restarting, the prohibited symbol appears on the screen (circle with line through) and my system restarts normally.

Important thing to not: I couldn't download Mojave from the App Store on my new computer, as a warning would stop me saying:

    Update not found
    The requested version of macOS is not available

So I had to download Mojave on my older computer to create the bootable install. I checked articles like https://macreports.com/update-not-found-the-requested-version-of-macos-is-not-available-fix/. But nothing seems to work so far.

Does anyone know how I might be able to either download Mojave on my new computer, allow my computer to downgrade through bootable install, or perhaps otherwise downgrade my computer?

  • Welcome to Ask Different :) What is the model of Mac that you have? – Nimesh Neema May 29 at 5:15
  • @NimeshNeema I own the 2019 MacBook Pro 16 in. – R0der May 29 at 15:49
  • You cannot downgrade a 16" MacBook Pro to run macOS Mojave as the version of macOS is unsupported. – Nimesh Neema May 29 at 16:17

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