Mac OS X: Known problems with upgrading OS X
From IThelp
Problems as of September 2017:
Concerning uprading to 10.13 (To High Sierra):
Apple released the new operating system Mac OS High Sierra(10.13) 25th of september 2017.
Aspects to consider when it comes to system updates We recommend awaiting the upgrade for a little while, and make sure you have a backup of all data stored on the computer before upgrading. The first release of an upgrade often contains bugs and errors which will be fixed in later update releases.
Contact BRITA if experience any problems. Issuetracker: http://bs.uib.no phone: +47 555 84 700