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. I understand you are trying to download and install macOS Sierra on your MacBook Pro, but after several attempts, the application won't install.
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