![]() To start up from macOS Recovery, hold down Command (⌘)-R immediately after turning on or restarting your Mac. ![]() Because you have OS X El Capitan installed on your MacBook, we can access Disk Utility from macOS Recovery. Let's also use Disk Utility to verify there are no issues with your Macintosh HD. MacOS Sierra requires 8.8GB of storage space to install. What does your computer show for Capacity and for Available (usually represented in GB)?.Right-Click on Macintosh HD and choose Get Info.Next, let's confirm that you have enough free space on your Macintosh HD for this installation: Use Time Machine to back up or restore your Mac ![]() If you have not already done so, please refer to the instructions below: The first thing I want to suggest is that you make sure you have a backup of your computer before making significant changes to it. Based on your model and the fact that you have OS X El Capitan currently on your system, macOS Sierra should be able to install. Nonetheless your mileage may vary, and it is certainly worth trying to reinstall using the steps above before turning to more drastic measures.I understand you are trying to download and install macOS Sierra on your MacBook Pro, but after several attempts, the application won't install. In my personal experience I reinstalled and clean installed yet still ran into the same kernel file table full errors, Safari issues, and application launch problems, which is what led me to downgrade from macOS Sierra to El Capitan on a particular Mac. Some users have reported that reinstalling macOS Sierra / macOS High Sierra this way has resolved some of the difficulties they have experienced with Sierra or High Sierra, so if you are having problems with macOS Sierra it may be a worthwhile troubleshooting step. If you want to erase everything and start fresh with a completely blank slate, you would perform a clean install of macOS Sierra instead, an entirely different procedure. Reinstalling will cause Spotlight and other background indexing processes to run again which can give the perception that Sierra is running slow but that will resolve itself after indexing has completed. Your user account, user files, applications, and all data and configurations should be preserved and untouched, only macOS Sierra / macOS High Sierra system software has been reinstalled. ![]() Once the reinstall process begins the screen will turn black and an Apple logo with a progress bar will appear, this will give you a loose estimate of how long it will take to reinstall macOS Sierra, but keep in mind it’s not always accurate and the actual installation process can sometimes be faster or slower.Īfter reinstallation has completed, macOS Sierra / High Sierra will automatically boot up as usual.
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