code: public File getLauncher() {
      if (System.getenv(LAUNCHER_ENV_VAR) != null && !System.getenv(LAUNCHER_ENV_VAR).isEmpty()) {
        options.get(LAUNCHER).setValue(new File(System.getenv(LAUNCHER_ENV_VAR)));
      }
  
      return (File) options.get(LAUNCHER).getValue();
    }
docs: Gets the launcher to use with {@link OperaLauncherRunner}, if any.  If {@link #autostart()} is
  false the launcher will not be used.  If not set, this method will return the default location
  of the launcher on your system.
  
  @return location of launcher