The error was: "Window cannot find 'c:/Users/ (my name) /Appdata/Local/Temp/4dc3c94c-7c0b-4f13-8849-54f0c9fb4302_s.../main.exe'.
It's possible that it's an issue with your antivirus. Conveniently, the sequel, Spirits of Steel: A New Dawn was just released, so maybe you can try that? https://gavgrub.itch.io/sosand