I have a MacBook Air (13 inch early 2015) with MacOS High Sierra 10.13.6. I have followed the instructions to upgrade this OS but it never shows an available update. How do I update this OS?
I have a MacBook Air (13 inch early 2015) with MacOS High Sierra 10.13.6. I have followed the instructions to upgrade this OS but it never shows an available update. How do I update this OS?
MacBook Pro 13″, macOS 10.13