`HTTP Error 403` when using Calculator.downloadModels

[ricardonpa]

Root cause: pysmartdl2.SmartDL uses HTTP range requests to support multi‑threaded downloads, which means it sends Range: bytes=… headers when fetching files. On Zenodo’s current infrastructure, these ranged requests to file URLs are rejected with HTTP 403 Forbidden, even though a plain, single GET using urllib.request.urlretrieve works fine for the same URL. As a result, Calculator.downloadModels fails with a 403 when using SmartDL, but succeeds when the same URLs are downloaded via urllib without range headers.

>>> Calculator.downloadModels("SIPFENN_Krajewski2022_NN30")
Fetching: SIPFENN_Krajewski2022_NN30
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/ricardonpa/Library/CloudStorage/GoogleDrive-ricardo.npa@gmail.com/Shared drives/Development/Codes/pySIPFENN/pysipfenn/core/pysipfenn.py", line 290, in downloadModels
    downloadObject.start()
  File "/Users/ricardonpa/miniconda3/envs/pysipfenn/lib/python3.11/site-packages/pysmartdl2/pysmartdl2.py", line 272, in start
    urlObj = urllib.request.urlopen(req, timeout=self.timeout, context=self.context)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ricardonpa/miniconda3/envs/pysipfenn/lib/python3.11/urllib/request.py", line 216, in urlopen
    return opener.open(url, data, timeout)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ricardonpa/miniconda3/envs/pysipfenn/lib/python3.11/urllib/request.py", line 525, in open
    response = meth(req, response)
               ^^^^^^^^^^^^^^^^^^^
  File "/Users/ricardonpa/miniconda3/envs/pysipfenn/lib/python3.11/urllib/request.py", line 634, in http_response
    response = self.parent.error(
               ^^^^^^^^^^^^^^^^^^
  File "/Users/ricardonpa/miniconda3/envs/pysipfenn/lib/python3.11/urllib/request.py", line 563, in error
    return self._call_chain(*args)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ricardonpa/miniconda3/envs/pysipfenn/lib/python3.11/urllib/request.py", line 496, in _call_chain
    result = func(*args)
             ^^^^^^^^^^^
  File "/Users/ricardonpa/miniconda3/envs/pysipfenn/lib/python3.11/urllib/request.py", line 643, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 403: Forbidden

We can either patch pysmartdl2.SmartDL to avoid range requests or bypass it in pySIPFENN using requests or urllib.request.

Here’s a minimal fix using urllib.request that preserves the main behavior of the current implementation: main...ricardonpa:pySIPFENN:main