What can I do if the latest update isn't compatible with my iMac?
Some websites not responding due to inability to upgrade browsers. Latest update isn't compatible with my iMac what can I do?
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iMac 27″, macOS 10.13
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If you can't upgrade your macOS to get a current version of Safari, another option is to use the current version of another browser such as Chrome: https://www.google.com/chrome/
The model year of an iMac is available at Apple menu > About This Mac.
An early 2009 iMac can be upgraded to El Capitan 10.11.6 but no later version. See: How to download macOS - Apple Support
A late 2009 through mid 2011 iMac can be upgraded to High Sierra 10.13.6 but no later version. See: How to download macOS - Apple Support
A late 2012 through late 2013 iMac can be upgraded to Catalina 10.15.7 but no later. See: How to download macOS - Apple Support
A mid 2014 and late 2014 can be upgraded to the latest version of Big Sur macOS 11 but no later. See: How to download macOS - Apple Support
A late 2015 or later can be upgraded to the current version of Monterey macOS 12. See: How to upgrade to macOS Monterey - Apple Support