I have a rMBP late 2012 with a 50GB Win10 partition and a 200GB El Cap partition. I am considering deleting the El Cap partition and giving Win10 all 250GB of SSD space. If I choose to renistall OS X, will I have to install a "hackintosh" version of it, or can I get a vanilla version of El Cap or something and install that as though it was fresh out of the factory?