Not too long ago, my OS got corrupted somehow and I decided to go back to a previous Time Machine save. I didn't lose very much of my data (thankfully), however, I ran into another problem. Most of the apps in the utility folder were lost in the transfer. It's like they never existed. And even if I tried to put them in from a backup, they don't register. And I'm trying to see why this happened and how to actually get them back. Would an upgrade to El Captain solve this issue and get them back? What should I do? Thanks.