"The requested version of macOS is not available."
Trying to update from Catalina to Big Sure on iMac 2015. Receiving this error once clicking "Get" button in store.
"The requested version of macOS is not available."
iMac Line (2012 and Later)
Question marked as
Top-ranking reply
With the above information in-hand - follow this How to get old versions of macOS and verify what version this computer Qualifies to install. For Best results use Safari to commence the download as Others may not work.
Safari will open a redirect and open the Apple Store where the download can commence
