My Blackmagic DeckLink card is not detected in Desktop Video Setup

This can happen after a Blackmagic driver upgrade, especially when they are 2x DeckLink cards from different models in the computer. For example, if the PC has 1x DeckLink Studio 4K and 1x DeckLink 8K Pro, the second card won't be detected in Desktop Video Setup.

Second card not detected In Desktop Video Setup

but detected in the device manager

Usually, Blackmagic detects the second card and suggests an update automatically.

If not, launch the Desktop Video Installer and click on Repair. Then restart the computer.

Open Desktop Video Setup and check your cards again. You should see the missing card now.