You'll have to join the queue of D7500 owners waiting for Raw support. Adobe has not updated Lightroom or Camera Raw support for that camera yet. Probably in the next update.
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One (probably unapproved) way to load the files in Lightroom is to use exiftool to change the file data to a supported camera. After you have downloaded and installed exiftool run a command like:
exiftool -model="NIKON D500" *.NEF
You should then be able to import the files to Lightroom. You should work on copies of your original files in case you mess things up and be aware that unexpected results might occur in Lightroom, but at least it should get you started.
I have been using Nikon Capture NX-D in the meantime.
Thank you! The exiftool and your command line works for me. Note that the exiftool.exe file need to be in the same folder as the NEF files.
Lightroom CC2015.12/6.12 has been released and now supports this camera. Please update your Lightroom to the latest version and let us know if you continue to see the issue. Thank you for your patience.