def download_files()

in setup.py [0:0]


    def download_files(self):
        for package in self.packages:
            dest = os.path.join(self.destdir, self.package_destination(package[1], package[2]))
            if os.path.isfile(dest):
                print('Skipping download of {dest}'.format(dest=dest))
            else:
                url = self.package_url(package[0], package[1], package[2])
                self.download_file(url, dest)