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Oct 01, 2015 10 thoughts on “ How to overcome OS X 10.11 El Capitan not installing ” hydrovacing October 2, 2015 at 7:30 am. Anyone know know another way to download EL Captain. I have had on of my Mac’s trying to download it since it came out. It is now at this moment at 4.81 GB. Jul 05, 2017 At the first, I thought the volume was dirty, so I booted to my working El Capitan again and had formatted the partition again. It still failed. Then, I thought it was the fact that I was using the installer in El Capitan to install it to the new partition. So, I created an installation USB. The problem surprisingly appeared!
But in El Capitan, any system file for which Repair Permissions would have restored these settings can no longer be modified during normal operating. Mount toggles to Unmount for volumes that. Jun 14, 2013 Replace VOLUMENAME with the name of a volume on the disk you are trying to unmount. Following this, attempt to Erase/Partition the drive again in Disk Utility. Using the above command can interrupt file read/writes, which can cause file corruption.
Check compatibility
You can upgrade to OS X El Capitan from OS X Snow Leopard or later on any of the following Mac models. Your Mac also needs at least 2GB of memory and 8.8GB of available storage space.
MacBook introduced in 2009 or later, plus MacBook (13-inch, Aluminum, Late 2008)
MacBook Air introduced in late 2008 or later MacBook Pro introduced in mid 2007 or later Mac mini introduced in early 2009 or later iMac introduced in mid 2007 or later Mac Pro introduced in early 2008 or later Xserve models introduced in early 2009
To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu . If your Mac isn't compatible with OS X El Capitan, the installer will let you know.
Unable To Unmount Volume For Repair El Capitan CaMake a backup
Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.
Get connected
It takes time to download and install OS X, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power.
Download OS X El Capitan
For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of macOS.
If you still need OS X El Capitan, use this link: Download OS X El Capitan. A file named InstallMacOSX.dmg will download to your Mac.
Install the macOS installer
Double-click the downloaded file to open a window showing its contents. Then double-click the file within, named InstallMacOSX.pkg.
Follow the onscreen instructions, which will guide you through the steps necessary to install.
Begin installation
After installation of the installer is complete, open the Applications folder on your Mac, then double-click the file named Install OS X El Capitan.
Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.
Unable To Unmount Volume For Repair El Capitan DriveAllow installation to complete
Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both OS X and related updates to your Mac firmware.
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