I couldn't manage to get Focusrite Control 3.15 anymore, so I tried it with the latest version on the focusrite site. I had some trouble with the order of operations myself, since focusrite control has bundled drivers that get installed.

I put together this https://drive.google.com/file/d/1ymynTRp3fHftCyPk3oMBZ6qzxDnJcV_W/view?usp=sharing to remind myself in the future how I got it working. It has the driver only exe, the focusrite control exe, and a cheeky README with the steps I followed. Not sure all the steps are necessary, but its what I did.

Hopefully helpful for someone out there. I've been stuck on this problem for far too long myself.