Photos won't open and when it does it displays this message: The application built with PhotoLibraryPrivate version 215.39.00 but is running with version 209.52.00

Were you a Beta tester for a different version of Mac OS X?

Today i run into the same Problem!

I need a fix for this please!

I've done nothing, it was working correctly few days ago... now i get this message and can't open via Application folder or Dock Symbol...

i need to backup my Photos from my iPhone and can't do it, because the Photos.app won't start up....

An Update from 10.10.4 to 10.10.5 didn't helped...

whats the problem APPLE !?!?!

Please see the response to your duplicate question - there is no need to post multiple times

and it is best to start a new thread with new questions - Writing an effective Apple Support Communities question - and of course you must answer questions to get help since no one here can see you

LN

Hi Larrry,

thanks for reply! -> I SOLVED IT !
( Sorry for duplicate question ) but fitted in both threads... and many users won't find all of these threads, if they get the same problem.... so i wrote it in all necessary threads...

I don't know why, but i deleted with "AppCleaner" the PHOTOS.app - afterwards i grabbed the COMBO Update .dmg for 10.10.3 and extracted the Photos.app from there to my Desktop... (with Pacifist) i tried again, and the same error showed up...

I was sure, that i have updated my Mac to 10.10.4 ... but i rechecked "About this Mac" and it showed that i have installed 10.10.3....

Maybe it happened because i deleted photos.app, i can't explain, why there was no 10.10.4 installed, i was 100% sure i installed it....

So i updated my Mac to 10.10.5 with Combo Update via AppStore.app , it took 20 min. and now back in OSX i moved the Photos.app from Desktop to Applications Folder and VOILA ! - it opens!

YEAH 🙂

Thanks for your Help!

PS: No BETA OSX installed or El Capitan etc....