Earlier this summer Apple announced that it’s working on the next release of OS X, code-named “Yosemite.” Apple is currently sharing access to the pre-release builds via a Beta program for developers, and may expand access to the beta in the future.
We wanted to share some guidance for anyone considering installing and using Creative Cloud desktop applications on pre-release versions of Yosemite:
We’re working hard to ensure that our Creative Cloud desktop applications work great on the next version of OS X. However, currently, running Creative Cloud desktop applications on the pre-release versions of Yosemite is not supported. Applications may install and run, but you may experience unexpected errors and issues. If you decide to install and run apps such as Photoshop CC or Illustrator CC on the Yosemite OS, we recommend that you backup your work, and also that you not use the apps for production work just yet.
You can find more information here.