I built a new PC this week with the following hardware:

RE: BlackMagic Intensity Pro 4k support Based on the software included and on the hardware, an XPS 8910 and up - in other words, don't count on running this on a consumer-level Inspiron desktop system. Blackmagic Design Intensity Pro 4K BINTSPRO-4K B&H Photo Video If you need an inexpensive way to jump into working with a wide variety of source types, this may be a great way to go. Don’t let Peo install the drivers.

Asus Z390-A motherboard
Intel i7-9700K CPU
32GB RAM
MSI GTX1060
2) Intensity Pro 4K cards

Blackmagic Design Software Download

Running Windows 10 Pro, latest build with all updates.
To install the driver, it was necessary to use the troubleshooting boot up with option 7 (disable driver signing). I was able to install and get my cards both up and running, as far as Desktop Video Setup letting me configure them, and Black Magic Media Express displaying video from either one of the cards on the Record tab, by selecting either device from the menu.
The only problem I was having is that OBS Broadcaster was displaying a black screen and no audio from the Black Magic WDM Capture devices.
Thinking that I needed to reboot the system to get OBS working, I did a system restart. Unfortunately, after restarting, both cards have vanished. Desktop Video Setup cannot detect a video device at all, and Media Express is showing no devices.

Black Magic Pro 4k Drivers

I looked in Device Manager and both Intensity Pro 4K cards are showing normal status 'This device is working properly.'
I downloaded the Intensity Pro 4K software from your website this evening, so I assume that's the latest version.

Intensity Pro 4k Driver Download 64-bit

Blackmagic Intensity Pro 4k Software

I've been using Windows 7 64-bit up til this week and had few to no issues with that setup, but this new O/S is driving me nuts. Things that worked, stop working after a reboot. I would go back to Windows 7 in a heartbeat if my motherboard supported it, but alas, no drivers and Win 7 install disc can't even detect a bootable drive. So I must slog it out with Windows 10 and try to get stuff to STAY working between bootups. I'm hoping someone has experience with these cards on Win 10 and with getting live video through OBS as well. All software is up to date. I have no idea if the Intensity cards have a need for firmware update to work in Windows 10. Perhaps?