OS X El Capitan launches Wednesday

Apple today reminded Mac owners that they can download OS X 10.11, aka El Capitan, free of charge starting tomorrow.[ Related: 8 tips and tricks for OS X El Capitan ]If the Cupertino, Calif., company follows past practice, it will add El Capitan to the Mac App Store around 10 a.m. PT.The upgrade will run on the same Macs that now run last year's Yosemite, 2013's Mavericks, 2012's Mountain Lion and 2011's Lion, according to Apple's system requirements. That means more than nine of out 10 Macs whi