Announcement: Upgrade to macOS Mojave

With features like Dark Mode, Stacks, and four new built-in apps, macOS Mojave helps you get more out of every click. 
Find out how to upgrade to macOS Mojave > https://support.apple.com/macos/mojave

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How to upgrade to macOS Mojave

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Question: Updating

When trying to update to High Sierra, I get a popup with an "Unknown error" and it cancels the update.

MacBook Pro, OS X Yosemite (10.10.5)

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Try rebooting in safe mode Apple Support

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Question: Updating