Had late 2013 mac pro and purchsed from adobe ps 6 or 13 first macpro just stopped working transfered hd to new mac pro also running 10.11.6 and even after un-installing ps 6 countless times I still can not get ps 6 to open... It ran great from time of purchase to when mac stopped working .... many years. Any suggestions Ps 6 is all I need and can really afford right now.