Hi Fabio, first of all, congratulations for this work :)

Some things that can be improved:

- Instead of using os.popen to run a subprocess, you can use the subprocess module of the standard library https://docs.python.org/3/library/subprocess.html

- Also you can download a file using the requests library

https://requests.readthedocs.io/en/latest/user/advanced/#body-content-workflow

Hope it helps :)