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How can I update iMac 27-inch late 2013 - Using High Sierra 10.13.6
You may update your mac to Catalina. This may not be your best move. Catalina only support 64bit apps. Your older apps may need to be updated. see this article:
You could upgrade to macOS Mojave and run all of your apps.
https://support.apple.com/en-us/HT211683
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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. Make sure to use Only Safari to commence the download as Others may not work. Safari will open a redirect and open the Apple Store where you can commence the download. If an error message appears, that is probably because one is using another Browser.
Suggest using Go64 to find 32 bit application before attempting the upGrade. Some or many of the Application already installed may required update or upGrades to 64 Bit Versions.
Make a Time Machine Backup Before attempting. Notation - Mojave is the Last version to support 32 bit applications / extensions and Drivers. Catalina & Big Sur support 64 bit and there is no workaround.
Are there any AntiVirus, Disk Cleaner, Optimizers, Un-installers, etc installed which should be removed as per Developers Instructions. They are useless, unneeded, cause havoc and interfere with the normal operation of the OS and may even Corrupt the OS requiring a Reinstallation
That iMac can update to macOS 10.15 Catalina.
See here: link-> How to get old versions of macOS - Apple Support
Uh oh...Mac too old?
