So I have a mid 2012 MacBook Pro w/ Retina display 15", a solid 750 GB SSD, and a 2.7 GHz i7 Processor with a Turbo up to 3.7 GHz and 16 GB of RAM.
When I decided to download El Capitan, I couldn't install it because I was formatted with MBR, thanks Windows. (Yes, I use Windows too)
So I...