https://github.com/widevinedump/NETFLIX-DL-6.0 seems to have just been replaced with https://github.com/widevinedump/NETFLIX-DL-6.1.0
Due to a bad connection the 6.0 clone didn't finish. So, naturally, I tried again and was receiving a login prompt....so I go to the URI in a browser and ... 404. But the 6.1 repo was available...