Because of that, Apple’s servers slow down. Whenever Apple releases an update for High Sierra, many Mac users will rush to download it. Prior to a Frozen High Sierra Installation If you still haven’t got past through the download stage, here are a few solutions to try: But regardless of the reason, we’re here to give you all the possible solutions for a stuck Mac High Sierra update. Perhaps, there are other issues with your Mac prior to updating. It could also be there is not enough space available on your Mac. It could be there has been a power shortage. There are many possible reasons why the installation is interrupted. As a result, the Mac OS Sierra installation gets stuck. However, in some cases, while updating your OS, things can get a little messed up. With just one click, you can go ahead and initiate the installation. Your Mac will simply tell you an update is available through a popup in the Notification Center.
Installing a new version of Mac OS Sierra should be an easy job.