Finally, you’ll want to be certain the Mac can run OS X El Capitan, the system requirements are fairly forgiving but double-check anyway.The OS X El Capitan installer, whether that’s running directly from the /Applicaitons/ folder as downloaded from Apple, or already made into a bootable El Capitan installer drive does not matter, either will work just fine.Back up the Mac with Time Machine, do not skip this, partitioning a Mac and installing new operating systems has some degree of risk and you do not want to be in a situation where you incur permanent data loss simply because you did not back up.Sufficient hard disk space available to partition the drive in question, and install OS X El Capitan onto that new partition (at least 40GB free is recommended, with a minimum of 20GB for El Cap – do not let either Mac OS X install run too low on available disk space as performance will greatly suffer).Before beginning, you will need the following:
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