software update

Back up your data, check your applications for compatibility, click here, and then on the download link for High Sierra. That model isn't capable of Mojave or above, or software which requires it.

(224070)

gransheshe Said:

"software update: Is my imac 27", Mid 2011 unable to get current software updates? I only see updates unavailable"

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For reference...

Ugrading a macOS:

Determine which macOS(s) can be Upgraded:

Incompatibility may be the issue here. If so, then that is because your Mac does not have the hardware to go past macOS 10.13 High Sierra.

I. Verify Compatibility:

A. Start Here: Learn About Compatibility and how to Identify your Specific Mac Model - Apple Support

B. How to Verify:

I. Reveal your Model:

What is the Model of your Mac? To find out...

1. Go to: Apple menu
2. Click: About this Mac
3. View: Second Line-Down

then...

II. Compare the Results:

See if the Model you found is shown here:

• macOS Monterey is Compatible with these Computers - Apple Support
• macOS Big Sur 11 Hardware Requirements - Apple Support
• macOS Catalina 10.15 - Hardware Requirements - Apple Support
• macOS Mojave 10.14 - Hardware Requirements - Apple Support
• macOS High Sierra 10.13 - Hardware Requirements - Apple Support
• macOS Sierra 10.12 - Hardware Requirements - Apple Support
• OS X El Capitan 10.11 - Hardware Requirements - Apple Support
• OS X Yosemite 10.10 - Hardware Requirements - Apple Support

III. If Compatible:

• Back Up your Mac First:  Be certain you Create a Time Machine Backup of your Mac, so that way you can have something to restore your Mac from, should anything go wrong with the reconfiguration.