I took the plunge and bought a new rMBP. I mistakenly restored my entire backup (instead of just my data) from my Time Machine backup. The photos app is now missing. When I check for updates on the App store, there is no option to re-download beta 10.10.3 nor is there an obvious way to bring back the Photos app. My library has already been converted, so I have to stick with the beta now. Any ideas?