The requested version of macOS is not available.
I am trying to Update to Big Sur and this is the message I get when I click to get the update. I don't understand what the issue is.
MacBook Pro 13″, macOS 10.15
Question marked as
Is your Mac from 2013 or 2014?
There were some issues with this models and Apple is probably working on a fix.
Take a look here If you can’t install macOS Big Sur on certain 13-inch MacBook Pro computers from 2013 and 2014 - Apple Support
For more details on it, call Apple Support.