I appreciate your frustration - we didn’t know either. We don’t and have never used IIS, so we rely on the community to help with installations on that platform.
We’ve tried to make it clear what is and isn’t supported at the top of the installation instructions (if you’re doing a manual/custom install): Xibo on a Web server | Xibo Digital Signage.
I think the solution will end up being getting it manually compiled - we’re following along with that here: V4.0.0 - Some Bugs + ZMQ Problems - #10 by dan