My iMac can not find the Big Sur OS up-date in the Apple story.
Trying to update my OS from Catalina to Big Sur from Apple Store. Looks like it's working but stalls on "finding the upgrade". Never ever "finds it"??
iMac 27″, macOS 10.15
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The Age of this computer will Govern what newer version of macOS it will Qualify to install. Use About this Mac from the Apple Icon on Desktop - the required Information will be there.
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.