You want to eventually install Sierra on, that is for later.) The disk that you are booted to at the time. (If the installation window asks which disk you want to install to, you must pick Install macOS Sierra.app which you will find in your Applications folder. This does not install Sierra but uses the InstallOS.pkg to create the That and an installation window will open, read and follow the prompts, When downloaded open to get InstallOS.pkg, double-click on The next section can only be done on a mac that is capable of running Sierra,Ī mac that came preinstalled with an OS later than Sierra will refuse to do the next bit. This downloads InstallOS.dmg to your Downloads folder. Go to Section 4 and click on Download macOS Sierra. How to upgrade to macOS Sierra - Apple Support If you do have an operating system on your mac and it is functioning then you can download Why are you trying to reinstall macOS Sierra?ĭoes your mac have a working operating system? So you are trying to use the Recovery Servers that should be the last resort. For information about servicing your Mac, see Find out how to service or repair your Mac. If you continue to have problems with your disk or it can’t be repaired, it may be physically damaged and need to be replaced. If your Mac has a Fusion Drive and you see a flashing question mark or alert, see the troubleshooting section of the Apple Support article About Fusion Drive, a storage option for some Mac computers. If that doesn’t work, back up as much of your data as possible, reformat the disk, reinstall macOS, then restore your backed-up data.
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