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Nikon D7000 is completely supported with Lightroom for tethering feature, refer: A list of cameras that can be tethered to Lightroom.
Please refer the troubleshooting doc : Fix tethered shooting in Lightroom
Let us know if that helps.
Thank you for your responded but unfortunately as I mentioned before I tried all without any resolution.
My last resource was to see on this forum and as I have read some people have the same problem without resolution.
Please let us know your workflow.
When you connect camera to your Mac, do you see it in finder Or any other software which detects it fine.
Also, Is your mac up to date to the latest release.
Tethering and direct camera import has been flakey at best for a LONG time in Lightroom.