We haven’t quite updated our fleet of Macs to macOS High Sierra for a variety of reasons. Some of our users have admin rights and performed the update themselves. We have purchased a number of new MacBook Pro’s that came pre-installed with macOS High Sierra to replace the Macs that are no longer upgradeable.
In the last few days I have had to help a couple of my High Sierra users with an issue they had with installing the OS X 10.13.2 supplemental update. They perform the update and when the computer reboots a message pops up saying “macOS cannot be installed on your computer”. The only option is to restart computer. When the user restarts the computer, they get the same error message and end up in a reboot loop.
For whatever reason it seems the installer is damaged and won’t install. Thankfully, it’s a pretty easy fix. You can boot into recovery mode holding CMD + R while computer is restarting. Go to the Apple Menu and Select Startup Disk. Select Macintosh HD (or whatever your HD name is) and reboot. This will reboot your computer and allow you to log in as normal. Go to the App store and install the supplemental update. It should install successfully this time.