Can't Download Big Sur -update not found
I have a late model 2013 iMac that Apple lists as being supported for Big Sur. (Model Identifier: iMac14,2) quad core, 32 GB memory and 235 GB available space on my 1 TB drive (flash storage)
However, when I attempt to download it from the App Store or system prefs, I receive the message "Update not found. the requested version of macOS is not available."
Nothing on the internet that applies to the released version (some similar issues reported when it was in beta)
Any help is appreciated.
iMac 27″, macOS 10.15