Using Firestick on Desktop

I tried installing a Firestick on a desktop PC using a Capture Device to change from HDMI to USB. I used an app I followed all instructions and researched everything I could find on the same issue. When the app was supposed to find my Firestick I would only get a black screen. The Firestick functions properly when plugged directly into a TV. Is what I want to do possible?
I actually tried to install on two seperate desktop computers. Same result…
Please Advise

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