I'm in the public beta program. I finally installed 10.10.3 and restarted. Photos is now in my dock and is greyed out. I try to open it and receive an error: You cant use this version of the application Photos with this version of OS* You have OS*X 10.10.2. The application requires OS*X 10.10.3 or later. I open Apple System Profiler and sure enough, "10.10.2" I go to App Store updates and it shows "10.10.3" under the recently installed updates. How do I trick my computer into installing the upgrade again or tricking it into thinking I'm running 10.10.3? everything else is functioning fine except I can't open Photos.app.