Hi (sorry for my english),
when from LR CC i chose modify with Photoshop CC, the system alert is : Some problems if u don't have ACR 9.10.
7 days ago, i try to install manually the last version of ACR 188.8.131.525. But the problem still persists!
Adobe has confirmed this is a bug. The message is incorrect. You can ignore it and use Photoshop anyway.