Then the new update of macOS Sierra 10.12.1 will be downloaded automatically for you. Click Apple Menu > Select App Store > Click Update next to macOS Sierra in the Update section.Reboot Mac and retry to download a new macOS Sierra update 10.12.1: Open Launchpad > Delete " Install macOS Sierra" file with a question mark on it.And you may follow below tips to fix this issue: And this has become a common issue that many users have to face while upgrading Mac to a new operating system. If your Mac shows a error message that "An error has occurred" or "Failed to Download" while you are trying to downloading a new update for macOS Sierra. ![]() Fix macOS Sierra fail to download or "An error has occurred" issue ![]() Download for Mac macOS 12.0 - 10.9 Also Available for Windows Step 2.
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