What camera are the files from?
As you probably know, photoshop cs6 can only use up to camera raw 9.1.1, while the current camera raw version is 9.5, so look at the following chart and see which version of camera raw your camera requires.
I've been using Nikon D7100. So it's supported version of camera raw is 9.1.1.
It's minimum required version of camera raw is 7.4. But I installed 9.1.1 as per CS6 can support upto this version. But my raw images can't be edited.
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If in photoshop cs6 you go to Help>About Plug-In and click on the words Camera Raw, what version does it say?
Did you use nikon transfer to get the nefs from your D7100 to your computer?