I am running SS 5 Pro on a MacBook (13-inch, Late 2009) with the latest updates to El Capitan, and had an issue when updating from the App Store last night. The update seemed to complete without issue, but I ended up with 2 icons in Launchpad. When I tried to launch one, I got a message that something was wrong with the app and I needed to delete and reinstall it. I did not have duplicates in the Applications folder
I deleted it and reinstalled, and it is running fine now, but I wonder what happened, and if there was anything I may have done to cause it. I am a Mac newbie so have a lot to learn...
P.S. - see you at NEAF :-)