How to upgrade my 2017 iMac to Catalina?
my Mac Retina 4K, 21.5 in., 2017 needs to upgrade its Mac OS Catalina 10.15.7 so I can use Turbo Tax CD.
How would I do this?
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iMac, OS X 10.11
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A 2017 or later iMac can be upgraded to the current version of Ventura macOS 13. See: How to upgrade to macOS Ventura - Apple Support
To upgrade to earlier versions, see: How to download macOS - Apple Support
Be aware that if you upgrade to Catalina 10.15 or later you will also need to update any non-Apple 32-bit apps. See: https://www.macworld.com/article/232735/how-to-check-if-mac-software-is-32-or-64-bit.html