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Here's everything you need to know about Mac OS X Yosemite and the WiFi issues that are plaguing users, including a possible fix. Plus discover the new features that have arrived with OS X 10.10, the fixes that arrived (and didn't arrive) with 10.10.1, and what to expect from 10.10.2. by Karen Haslam | 02 Dec 14

Though it’s certainly possible to run both iPhoto and Photos app on the same Mac, it’s best to not try to juggle using both the apps so as to not confuse or mess up an image library, users should really stick to one app or the other.

f you really want to use both, be sure to create different photo libraries for both apps so they do not overlap while both in use.

Most commonly, Mac users will encounter the following error message when trying to launch iPhoto on a Mac with Photos app: “In order to open “iPhoto.app”, you must update to the latest version. The version of iPhoto installed on this Mac is not compatible with OS X Yosemite. Download the latest version for free from the Mac App Store.” but when you click on “Search App Store”, you’ll get an error saying “Item Not Available”.