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operating system how to upgrade late 27 iMac 2009 to high sierras

How do I

upgrade late 27'' iMac 2009 to high sierras.right now i have OS X EL Capitan

iMac, OS X 10.11

Posted on Dec 13, 2021 11:20 AM

Reply
4 replies

Dec 14, 2021 7:37 AM in response to pramod5000

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.  For Best results use Safari to commence the download as Others may not work.


Safari will open a redirect and open the Apple Store where the download can commence


Make Time Machine Backup  is very useful and can be used to Revert to Previous Working macOS


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

operating system how to upgrade late 27 iMac 2009 to high sierras

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