Q: canon 1dx mark ii support

We are users like you. No one here would know.

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Your camera is currently supported - Digital camera RAW formats supported by OS X El Capitan - Apple Support

Are you up to date? You may need El Captain - OS X 10.11.5

since we only know what you tell us it helps if you provide details like version of the OS  you have

LN

I guess I do not understand the Canon names then - the Canon EOS 1dx is listed but the Canon EOS 1 dx mark ii is not

Generally Canon products are quickly supported so I would expect support soon - until then you need to use the Canon software that came with your camera to process the RAW or check Adobe RAW convertor to see if it will do the processing

LN

or shoot JPEG

you are welcome

LN