download the fluidnc-maslow4-0.79-win64.zip from here: Release v0.79 · BarbourSmith/FluidNC · GitHub . Inside this should be instructions of what to run. I use a mac / linux and use a different process so I have not actually tried this but this seems to be the easiest for windows.
If you are a developer type, you can also use “platformio” in the checked out source code dir.