I also wanted to return to Catalina, but the App Store refuses to download older installers. Even with the Catalina installer, I couldn't create an installation USB key from the Terminal. He replied that he could not find the "createinstallmedia" command.
(sudo: /Applications/Install macOS Catalina.app/Contents/Resources/createinstallmedia: command not found)
We are prisoners of Big Sur.
Only solution found : to use macOS Recovery.
a) create a disk partition.
b) restart with the Shift-Option-Command-R combination, to install the original OS of the machine on the partition.
c) then upgrade to Catalina.
Be careful to install the OS on the partition and not to erase the whole disk!
puremalt_50yo
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