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I have a MacBook Air running Mac OS X Lion 10.7.5. I wish to upgrade it to macOS Sierra, but it requires at-least OS X Mountain Lion 10.8 which is not available anymore in the App Store.

Is there any other way to update the OS?

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I figured out I can still download El Capitan so should solve the problem.

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If you aren't specifically looking to run macOS Sierra, Apple recommends upgrading to macOS High Sierra.

You can find the instructions to download and install macOS Sierra here:

How to download macOS Sierra

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