Unfortunately for you, the last version of Camera Raw compatible with Photoshop CS6 is version 9.1.1. There is nothing you can do about that. However, if you have a camera that is too new to be supported by that version, you can always download the free DNG converter and create DNG or digital negative copies of the raw images that can be supported in the version you are using. I don't know if you are aware of the DNG alternative, but the digital negative files will contain all the original raw data and you will have all the raw editing capabilities 9.1.1 has to offer. You just won't have all the new features that have been added to Camera Raw in the later versions.
The only downloadable version of Camera Raw as a separate entity is called Lightroom, and it's only available as a subscription which I suspect you aren't interested in.