Chosen Solution
I have a 2013 Macbook Air running Mountain Lion 10.8.5, and I want to upgrade to El Captain FOR FREE! How do i do this???? Please help!
Go under the Apple icon in the upper left hand corner to App Store. On the Updates page you will probably see Sierra. Apple makes finding the El Capitan download difficult. So if it is not there, go here: https://support.apple.com/en-us/HT206886
