Try to check your antivirus quarantine for SignalRgbService.exe and restore it. You can also try to add a SignalRGB folder exception in your antivirus, then click Install again
If that fails, delete this file if present, then reinstall: %LOCALAPPDATA%\WhirlwindFX\SignalRgb\service\SignalRgbService.exe
If it still doesn’t work, you can do a clean reinstall next. Let us know if it persists.