code: public static Path getWindupHome()
      {
          String windupHome = System.getProperty(WINDUP_HOME);
          if (windupHome == null)
          {
              Path path = new File("").toPath();
              LOG.warning("$WINDUP_HOME not set, using [" + path.toAbsolutePath().toString() + "] instead.");
              return path;
          }
          return Paths.get(windupHome);
      }
docs: The path $WINDUP_HOME (where Windup is installed.)