We sell some adapters, but it looks like the Amazon listing is not active right now.

Here's the link to our web shop if you want to purchase there.

Here's an adapter from Plugable on Amazon that should work.

Didn't get any answers. But, just in case someone comes across this via Google or something, I did a bunch of extensive testing and Googling and I think I found the answer.

I'm using an HDMI to DisplayPort cable. The capture card DOES NOT like that. You have to have an "Active DisplayPort to HDMI" adapter.

Something like this will do the trick: https://www.amazon.com/Plugable-DisplayPort-Supports-displays-3840x2160/dp/B00S0C7QO8/