My Macs are 2011 and 2012 respectively. I had to downgrade my dual bootable HDs in my mac mini from El Capitan to Mavericks because of I was UNABLE TO SEARCH my mac mail or anything else in El Capitan. I also downgraded because Photos sucks, I like iPhoto much better, it is much more editable and user friendly. So what's the actual reason I can't upgrade Safari in Mavericks? I don't need bells and whistles from El Capitan or anything above that. Plus, why should I take MY TIME to learn a new OS if I don't feel like it? Apple is supposed to be about MY PRODUCTIVITY, not their need to upgrade every minute. And I don't have the time to even be writing this thread, much less learn a new OS every year. What exactly is preventing me from upgrading Safari on Mavericks? I don't get it. It works, it's stable for me and much more productive than any other OS.