The vast majority of Macs update to mac OS Sierra without any adverse incident.Sometimes when users attempt to download mac OS Sierra from the Mac App Store they will confront a “An error has occurred” red message and the download stops.For most users, installing mac OS Sierra has gone without a hitch and they’re left with a trouble-free Mac that works great with the latest mac OS system software release.But, not everything goes smoothly for everyone, and sometimes updating to mac OS Sierra can lead to a variety of problems.If you're a developer you will find tools, headers and libraries allowing to write Windows console or GUI applications that make use of significant parts of the POSIX API.
If you need any assistance with installing or using Sophos Endpoint Security, please contact the ITS Customer Support Center.
The Uof R has licensed Sophos Antivirus for Windows 7/10, and OS X systems (10.9 and above) to be available for use on University owned equipment, including Evergreen machines, Evergreen opt-out equipment, machines purchased with APEA funds or any other Windows or Macintosh systems purchased with University funds.
It is assumed that Sophos will continue to run on Windows systems prior to Windows 7 SP1 but this has not been tested.
The solution to this is fairly straight forward: Delete any existing Sierra installers, whether they are half-downloaded or not, reboot the Mac, and try again.
I ran into variants of the download trouble several times.