"And EN/ML here : DOWNLOAD PORTA" I see it support only, not DS-7816N-K2.
Supported Product List I series NVR DS-76xxNI-I2 DS-76xxNI-I2/xP DS-77xxNI-I4 DS-77xxNI-I4/xP DS-96xxNI-I8 DS-96xxNI-I16 K series NVR DS-76xxNI-K1 DS-76xxNI-K1/P DS-76xxNI-K2 DS-76xxNI-K2/xP DS-77xxNI-K4 DS-77xxNI-K4/xP E...