So I have a Macbook Air, and have just downloaded the latest OS X El Capitan. But when I go to install it says, 'OS X will not install on Macintosh HD' .
Why is this the case? What do I need to do to make it install? Please somebody help!
MacBook Air, OS X Mavericks (10.9.5)
Posted on Feb 6, 2016 3:51 AM