System software for MacBook Air

noriaki153 Said:

"System software for MacBook Air: I’m using MacOS High Sierra 10.13.6. Is there a more newer system I can use on this MacBook Air 2012 model."

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No.

Mid 2012 or Newer:

If it is a "Mid 2012 or Newer", however, you can go up to Big Sur on certain models.

•  macOS Monterey 12 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

noriaki153 Said:

"System software for MacBook Air: I found out on an Apple site that the highest would be MacOS Catalina 10.15. I was able to download and it’s loading now. Thanks for the suggestions."

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You are welcome.