What do I need to update to macOS Sierra 10-13.6?

There is an early 2015 MacBook Air and a 2017 model but no 2016 model according to Apple: Identify your MacBook Air model - Apple Support

Both can be upgraded to macOS Monterey or earlier.

According to Quicken https://www.quicken.com/support/mac/quicken-system-requirements they currently support Ventura, Monterey and Big Sur.

To upgrade, see: How to download macOS - Apple Support

Be aware that if you upgrade to Catalina 10.15 or later you will also need to update any non-Apple 32-bit apps. See: https://www.macworld.com/article/232735/how-to-check-if-mac-software-is-32-or-64-bit.html

Corbasket Said:

"What do I need to update to macOS Sierra 10-13.6?: I want to use the new quicken version but it requires an update to Mac Sierra 10-13.6 What do I need to do?"

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For reference...

Upgrading to macOS High Sierra:

Determining which Upgrade(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:

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 High Sierra 10.13 - 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.

What type of Mac (iMac, MacBook Air, etc) and what model year is it, and what version is it currently running? All 3 of those are available at Apple Menu > About this Mac.