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I want to upgrade from OS Sierra to OS Catalina but cannot find it in the App Store


iMac 21.5″ 4K, macOS 12.0

Posted on May 13, 2022 7:32 PM

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Question marked as Best reply

Posted on May 13, 2022 7:36 PM

NikonS2 Said:

"Upgrade: I want to upgrade from OS Sierra to OS Catalina but cannot find it in the App Store"

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Determining which macOS(s) can be Upgraded:


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:


III. If Compatible:

3 replies
Question marked as Best reply

May 13, 2022 7:36 PM in response to NikonS2

NikonS2 Said:

"Upgrade: I want to upgrade from OS Sierra to OS Catalina but cannot find it in the App Store"

-------


Determining which macOS(s) can be Upgraded:


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:


III. If Compatible:

May 14, 2022 3:26 AM in response to NikonS2

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.


macOS Catalina 10.15 hardware requirements


macOS Mojave 10.14 hardware requirements


macOS High Sierra 10.13 hardware requirements



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


Notation - Mojave is the Last version to support 32 bit applications / extensions and Drivers. Catalina, Big Sur & Monterey supports only 64 bit and there is no workaround.


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.

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