Não é possível instalar este pacote apenas com o PyCharm ou o prompt de comando:

Collecting socket
  Using cached socket-0.5.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "C:\Users\ADMIN_~1\AppData\Local\Temp\pip-build-v6d_dkqz\socket\setup.py", line 2, in <module>
        raise RuntimeError("Package 'socket' must not be downloaded from pypi")
    RuntimeError: Package 'socket' must not be downloaded from pypi


Command "python setup.py egg_info" failed with error code 1 in C:\Users\ADMIN_~1\AppData\Local\Temp\pip-build-v6d_dkqz\socket\

Baixar o pacote separadamente e instalar não funciona também.