Did you install the drivers before disabling driver signature checks?
The optimize drivers fucking suck and I doubt they ever fixed them since 2015.
I’m sure there is a non nuclear option but whenever I’ve made the mistake of installing the drivers both before disabling signature checks or if I plugged in the capture card prior to installing the drivers properly (signature checks disabled) it would cause windows to never see the capture card until I completely reinstalled the operating system
The optimize kits used some hacky drivers to get it to work, and from my understanding using multiple so I could never find out the exact ones to uninstall.
TLDR try another computer if you have it, and DONT plug the capture card in until you, disable windows driver checks, install the drivers, and do a PC restart first. I guarantee if your soldering is done correctly that doing either this or just reinstalling windows(unless you find a less nuclear option) will fix your issue
I hate hate these capture kits lol