Hi. Why I am not able download latest version for my iMac? Currently I have OS X Yosemite
How can I download latest IOS for my Mac? I have OS X Yosemite. Computer was purchased Mid 2011
Thank you
iMac 21.5", OS X 10.10
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You can probably upgrade to macOS High Sierra, Mojave and Catalina need a 'Metal' capable graphics card,
which your Mac does not.
The model and year of your Mac will determine which macOS you can upgrade to,
read the following links.
https://support.apple.com/macos/mojave
How to upgrade to macOS High Sierra - Apple Support
How to upgrade to OS X El Capitan - Apple Support
Before upgrading make a full back up of your Mac.
Check that third party apps you use have updates available for the new OS.
Check that your printers/ scanners etc have updated drivers and software available for the new OS.