DNG 8.5 did not work either to change raw files from the Nikon D5200 camera. The problem seems to be in using Nikon Transfer software to transfer raw files to the computer. None of the raw files will open in Adobe software (but will still open in Nikon NX software) when Nikon Transfer is used. Apparently Nikon Transfer screws up the raw file so Adobe programs cannot recognize the file.
When I plug the SD card directly into my Mac Pro and drag all files directly onto the computer without using Nikon Transfer then the Nikon raw files can be read in Photoshop CC so I guess that I solved the problem without any help from Adobe or Nikon.
There may be many thousands of Nikon users who have this problem!
Robert Cullers