Just installed Lightroom CC 2015 (i.e. Lr 6) via the Creative Cloud app. The install went fine but when I launch the app the splash screen flashes and then Lightroom quits. I tried uninstalling and re-installing again but the same problem persisted. I am on a Mac-book pro Mid 2014 with 2.5ghz i7 processor and GT 750M graphics card. (I have have no problems running Lightroom 5 on this machine).