Hi,
I've ended up with the same problem. Running Arch Linux host with Win10 guest and have passed through all 4 Renesas controllers. Tried installing the drivers from the CD but I'm still unable to use the USB3 ports. Device Manager shows that same that you have:
My Arch host is also unable to use the card it seems either, so I wasn't sure if it was Windows or a VM issue either, but I know it works for other distros. I thought it may have been some driver conflict so for now I've got the vfio-pci driver on the Renesas controllers on my host so it can hopefully be passed through relatively uninterrupted as I only really want the card for my VM anyways so I don't care if the ports don't work on the host right now, but as far as I can tell it's being passed through properly and it's just a pain in the ass driver issue. Could be wrong though. If I get anywhere further I'll post it here.