Using Decklink HD Pro and Decklink Duo

I have these 2 cards, one on PCI Express and the HD Pro Dual Link is PCI-X. I thought that these cards would both have dual inputs and outputs. However, I see nothing on the Dual Link card. I've read that I need to use older drivers on that card but I'm not sure which one is which and how to get that older driver installed.

I'm using VMIX so I need to have 3 inputs and an output. Right now vmix hates the card, I'm guessing due to the drivers.

Please help if you can, I have a show with this on Thursday and absolutely need this to work.