I want to upgrade my Mac OS Catalina 10.15.7 to Big sur

Which 13" MacBook Pro do you have? What does  > About This Mac say about the hardware model and model year / time of year? That will determine how far you can upgrade.

For some 13" MBPs, Catalina is the end of the line. There are others that are compatible with Catalina that you can upgrade all the way to Sonoma. If your MBP can be upgraded to Ventura or Sonoma, you should skip Big Sur – and go directly to one of those two. Even Monterey will still be one of the "most recent three" for a short while longer – making it preferable to Big Sur if your MBP is compatible with it.

kc772 Said:

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Upgrading a MacBook Pro 2010 to Catalina:

Your model can only go so far. So, what happens when you try to perform the update? Does it not work?

For reference...

Determining which macOS(s) will Install:

I. Verify Compatibility:

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

B. How to Verify:

II. 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 Big Sur 11 Hardware Requirements - Apple Support
• macOS Catalina 10.15 - 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 restor

Back up your data, check the application compatibility table, click here, and if your MacBook Pro is a late 2013 or newer model, then on the download link for a higher OS.

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