I have a GeForce GTX 960 GM 206 with a 5.2 CUDA, but when I open DAIN, first a DMC window appears and then a pop-up that says

"WARNING!

No available CUDA detected.

You will not be able to create interpolations with this application.

Only Graphic Cards that have Hardware compatible with CUDA 5.0 or above can be used."

Unsure if DAIN requires it, but you may need to install cuDNN in order for CUDA to be detected (I did to be able to use a different ML app):
https://developer.nvidia.com/cudnn

It should work with your card. Are you drivers updated?