docs: def start(self):
          """Download files using wget or other downloader.
          Optional curl, aria2c and httpie
          """
          dwn_count = 1
          self._directory_prefix()
          for dwn in self.url:
              # get file name from url and fix passing char '+'
              self.file_name = dwn.split("/")[-1].replace("%2B", "+")
  
              if dwn.startswith("file:///"):
                  source_dir = dwn[7:-7].replace(slack_ver(), "")
                  self._make_tarfile(self.file_name, source_dir)
  
              self._check_certificate()
              print("\n[{0}/{1}][ {2}Download{3} ] --> {4}\n".format(
                  dwn_count, len(self.url), self.meta.color["GREEN"],
                  self.meta.color["ENDC"],
                  self.file_name))
              if self.downder in ["wget"]:
                  subprocess.call("{0} {1} {2}{3} {4}".format(
                                  self.downder, self.downder_options,
                                  self.dir_prefix, self.path, dwn),
                                  shell=True)
              if self.downder in ["aria2c"]:
                  subprocess.call("{0} {1} {2}{3} {4}".format(
                                  self.downder, self.downder_options,
                                  self.dir_prefix, self.path[:-1], dwn),
                                  shell=True)
              elif self.downder in ["curl", "http"]:
                  subprocess.call("{0} {1} {2}{3} {4}".format(
                                  self.downder, self.downder_options,
                                  self.path, self.file_name, dwn), shell=True)
              self._check_if_downloaded()
              dwn_count += 1