Macbook Air
Can I update my MacBook Air (Early 2015) to High Sierra ? My current OS X El Capitan
MacBook Air
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Sure. Visit the How to get old versions of macOS, using only the Safari browser for a successful download of High Sierra. If you have intentions of install Microsoft Office 365, or Office 2019 for Mac, better make that Mojave as that is now Microsoft's minimum operating system requirement.