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Alternatively, you might find that your Mac gets stuck in the installer with a message that "mac OS could not be installed on your computer".
When we clicked Restart the same thing happened, in the end, the only way we were able to fix it was by starting in Safe Mode and downloading the installer again. If your Mac appears to have frozen during the install, it's worth listening to your Mac for signs of life - you may be able to hear whiring - and following the below advice.
However, you want to be absolutely sure that the installation isn't still running in the background because forcibly rebooting the Mac during an installation will interrupt the installation process and potentially cause you to lose data.
It's one reason why it's recommended that you back up your Mac before you install new software.
In our experience one minute it tells us there will be a two-hour wait, then 45 minutes, then an hour, before jumping down to 20 minutes.
Sometimes things get slowed down because the Mac is taking a while to install one file behind the scenes and that's thrown the whole update time prediction out the window.
When Apple releases a new mac OS update a lot of people will rush to grab it, which can cause problems with Apple's servers.
If you've seen the warning: "The mac OS installation couldn’t be completed " we're here to help.Read more: How to fix Wi Fi problems on Mac You might be able to cancel the download, but the method will depend on what version of mac OS you have installed.