解決済み
このトピックへの返信は締め切られました。
I have had the same issue using OS 10.15.6. Not only did the downloader not find any "valid files," even though it recognized my Nikon D850, it froze. I had to force quit the downloader. That said, when I tried again, it worked.
It turns out that my issue was the cable. Nikon's cable leave a lot to be desired. It's faster to just pull the card from the camera anyway.
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