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I feared that may be the answer, I am currently using Adobe DNG Converter and I am not ready for CC yet. I want a few years out of CS6 and will only go CC when forced to, looks like LR6 it is then.
"dusting off the D4s".....gosh, my first thought is....If you are not going to use the thing, send it on and I will keep it well fed and exercised.... )