upgrade OSX from el capitan to Big Sur on iMac 27inch late-2013
why does it say it cannot be installed even though the minimum version is 10.9 while i have 10.11.6 currently?
iMac 27″, OS X 10.11
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The last version of Mac OS a vintage 2013 will run is 10.15.7, Catalina. To upgrade please click How to get old versions of macOS and read it VERY carefully before doing your upgrade(s). If you have a need for Big Sur, it is time to buy a newer Mac.