The other installation process is known as the clean install. It replaces the contents of a selected volume with a new, pristine version of OS X El Capitan that does not include any previous versions of the, applications, or data files that may have been present on the selected drive. The clean install method is a good choice for testing a new OS on a dedicated drive or partition, or when you have been experiencing software related issues with your Mac that you have not been able to fix. When the problems are severe enough you may be willing to trade keeping all of your apps and data for starting with a clean slate.
![Capitan Capitan](http://cdn.osxdaily.com/wp-content/uploads/2015/09/os-x-el-capitan-download-app-store.jpg)
Apple Mac OS X 10.11 El Capitan Bootable USB Installer, Update, Upgrade OSX £ 12.99 Apple Mac OS X 10.11 USB Installer will allow you to update, upgrade OSX or install a clean system onto your hard drive. Mac I can't upgrade from OS X Lion 10.7.5 to El Capitan (self.applehelp) submitted 2 years ago * by sinsinsalabim I'm on a Macbook Pro which I've read is compatible with El Capitan.