An unexpected error occurred while updating required files mac Sexchatmobile
Some of the installation issues we’re going to mention can cause loss of data.
Having a Time Machine backup or a clone of your current system can be a lifesaver.
This error message is an oldie, but could be seen by someone upgrading from OS X Yosemite and earlier to OS X El Capitan or later.
Before we get too far along, I want to point out the obvious: don’t install a new version of the Mac operating system without having a current backup.A rather obscure issue with the Date & Time preferences can prevent installation of a new version of the mac OS. Be sure to verify that the time zone is also correct.Launch System Preferences by selecting the System Preferences icon in the Dock, or by selecting System Preferences from the Apple menu. To make changes, you’ll need to unlock the padlock with your administrator password.This is a good reason to download the official copy from the Mac App Store, or join the free public beta program if you want to try out a new version of the Mac OS early.Other possible causes include a damaged boot drive.