After cleaning disk and installing a fresh copy of El Capitan I cannot use Migration Assistant to get my old data back onto my new install. I get an error "volume contains os x install media". I have looked everywhere before posting and cannot find but two people having the same problems but no answers or fixes. My older OSx cannot upgrade to El Capitan because something else is installed preventing it from upgrading. Apple support for 3 hours could not fix, so I decided to just install new copy but I loose EVERYTHING. Anybody here have a solution? Joe L.