Fully tested, fully functional.
To find the drivers on the Magewell website, search for xi104xusb, then in the search results, click the top link. Then download the driver pack from that page. I know it's not the "right" product, but that's the only way I can find to download the driver pack for the first generation of Magewell Capture cards. Once downloaded, extract all, then find the Xi400DE-HDMI folder and run the installer in there.
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