Error installing Twisted on Windows 10, Python 3.8.0

Question

Can't install Twisted with pip install Twisted [windows_platform] on Windows 10 with Python 3.8.0. Error:

ERROR: Command errored out with exit status 1:
     command: 'c:\users\darkfox\appdata\local\programs\python\python38\python.exe' -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\darkfox\\AppData\\Local\\Temp\\pip-install-m3igdq78\\Twisted\\setup.py'"'"'; __file__='"'"'C:\\Users\\darkfox\\AppData\\Local\\Temp\\pip-install-m3igdq78\\Twisted\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base 'C:\Users\darkfox\AppData\Local\Temp\pip-install-m3igdq78\Twisted\pip-egg-info'
         cwd: C:\Users\darkfox\AppData\Local\Temp\pip-install-m3igdq78\Twisted\
    Complete output (83 lines):
    Traceback (most recent call last):
      File "c:\users\darkfox\appdata\local\programs\python\python38\lib\urllib\request.py", line 1317, in do_open
        h.request(req.get_method(), req.selector, req.data, headers,
      File "c:\users\darkfox\appdata\local\programs\python\python38\lib\http\client.py", line 1230, in request
        self._send_request(method, url, body, headers, encode_chunked)

   //delete fragment

      File "c:\users\darkfox\appdata\local\programs\python\python38\lib\ssl.py", line 1309, in do_handshake
        self._sslobj.do_handshake()
    ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1108)

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "c:\users\darkfox\appdata\local\programs\python\python38\lib\site-packages\setuptools\package_index.py", line 766, in open_url
        return open_with_auth(url, self.opener)

      //delete fragment

        raise URLError(err)
    urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1108)>

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "C:\Users\darkfox\AppData\Local\Temp\pip-install-m3igdq78\Twisted\setup.py", line 20, in <module>
        setuptools.setup(**_setup["getSetupArgs"]())

      //delete fragment

      File "c:\users\darkfox\appdata\local\programs\python\python38\lib\site-packages\setuptools\package_index.py", line 779, in open_url
        raise DistutilsError("Download error for %s: %s"
    distutils.errors.DistutilsError: Download error for https://files.pythonhosted.org/packages/f5/1d/c98a587dc06e107115cf4a58b49de20b19222c83d75335a192052af4c4b7/incremental-17.5.0-py2.py3-none-any.whl#sha256=717e12246dddf231a349175f48d74d93e2897244939173b01974ab6661406b9f: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1108)
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

This is a clean installation of windows 10 with just installed python 3.8.0. Python downloaded from official site.

Answer 1

Try downloading the twisted whl file from this link. Download the file with cp38 in its name.

After downloading the file, open a cmd in that folder and run the command:

pip install <file.whl>

For example, if you downloaded Twisted‑19.7.0‑cp38‑cp38‑win_amd64.whl, use

pip install Twisted‑19.7.0‑cp38‑cp38‑win_amd64.whl