No se puede instalar pdfminer.six en Windows 10

En mi ventana cmd, escribí

pip install pdfminer.six 

Y me da estos errores.

 Microsoft Windows [Version 10.0.15063] (c) 2017 Microsoft Corporation. All rights reserved. C:\Users\Eric Kim>pip install pdfminer.six Collecting pdfminer.six Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', NewConnectionError(': Failed to establish a new connection: [Errno 11001] getaddrinfo failed',))': /simple/pdfminer-six/ Retrying (Retry(total=3, connect=None, read=None, redirect=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', NewConnectionError(': Failed to establish a new connection: [Errno 11001] getaddrinfo failed',))': /simple/pdfminer-six/ Retrying (Retry(total=2, connect=None, read=None, redirect=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', NewConnectionError(': Failed to establish a new connection: [Errno 11001] getaddrinfo failed',))': /simple/pdfminer-six/ Retrying (Retry(total=1, connect=None, read=None, redirect=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', NewConnectionError(': Failed to establish a new connection: [Errno 11001] getaddrinfo failed',))': /simple/pdfminer-six/ Retrying (Retry(total=0, connect=None, read=None, redirect=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', NewConnectionError(': Failed to establish a new connection: [Errno 11001] getaddrinfo failed',))': /simple/pdfminer-six/ Could not find a version that satisfies the requirement pdfminer.six (from versions: ) No matching distribution found for pdfminer.six 

Uso Python 3.6 en Windows 10. ¿Qué debo hacer? ¿Hay alguna manera de que pueda instalar este paquete sin usar pip? Quiero usar este enlace: https://pypi.python.org/pypi/pdfminer.six/20170720

Soy bastante nuevo en progtwigción, así que no sé mucho.

Este es un problema de proxy, como lo indica el mensaje de error de rebash. Tu pip no se conecta a internet a través del proxy.

Pruebe pip --proxy url:port pdfminer.six con url:port beeing su proxy, por ejemplo, proxy.example.com:8080 .

Si esto no funciona, intente usar otra conexión a Internet sin un proxy para instalar paquetes a través de pip, o eche un vistazo a este hilo , que tiene más respuestas con respecto a pip y proxy.