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Released in 2016, macOS Sierra marked a pivotal shift in Apple’s desktop operating system, most notably rebranding "OS X" to "macOS" to align with iOS, watchOS, and tvOS. It was the version that first brought to the Mac, introduced a Universal Clipboard

If you see "This copy of the Install macOS Sierra application is damaged," your system clock is wrong (Sierra’s certificate expired in 2021). Open Terminal from Utilities, type date 010100002021 (sets date to Jan 1, 2021), then retry the install. mac os sierra 1012dmg download free

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