Where is Big Sur install file?
I'm in the middle of updating various machines to Big Sur, and right in the middle of it all, without any warning, Apple have removed the Big Sur installer and replaced it with a new OS.
I need to get BIG SUR not Monterey, as the software i run is not yet qualified to run the new software, but requires i have Big Sur!
I can find a list of all the other OS installers here:-https://support.apple.com/en-gb/HT211683
but the one link for "how to upgrade to Big Sur" takes you to the Monterey page!
please help!!