To be perfectly clear this is meant to be a compilation for potential issues experienced with the mac OS Sierra update process.
Most of this will not be encountered by the average user, and is in no way suggestive of what to expect during the Sierra update or installation process.
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We’re compiling a list of common problems in this troubleshooting guide to remedy issues with the mac OS Sierra download, installation, update, and post-install process.
Unfortunately for me (but fortunately for you readers), I personally have had the joy of encountering many of these problems during and after updating one particular Mac Book Pro to Mac OS Sierra 10.12, so I have very recent extensive firsthand experience with troubleshooting much of what is covered here.
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.