The README file states that the FSD-WindowsNoEditor.pak file is located at \Deep Rock Galactic\FSD\FSD-WindowsNoEditor.pak, when it, in fact, actually located at \Deep Rock Galactic\FSD\Content\Paks\FSD-WindowsNoEditor.pak.
I was following the instructions and couldn't find the file, so I'm creating this issue as the example path in README is wrong. Thanks for fixing.