docs: public VacuumSounpackInstallState installSoundpack(String url, String md5, int soundId) throws CommandExecutionException {
          if (url == null || md5 == null) throw new CommandExecutionException(CommandExecutionException.Error.INVALID_PARAMETERS);
          JSONObject install = new JSONObject();
          install.put("url", url);
          install.put("md5", md5);
          install.put("sid", soundId);
          JSONArray ret = sendToArray("dnld_install_sound", install);
          if (ret == null) return null;
          return new VacuumSounpackInstallState(ret.optJSONObject(0));
      }