לעברית לחצו כאן
Download the Security certificate from here http://netfree.link/netfree-ca.crt and save it on the computer.
Now create a text file named pip.ini (in Linux pip.conf) in the folder named pip in this path:
C:\Users\ <users folder> \AppData\Roaming\pip
(If the folder does not exist, create it)
Write in the pip.ini file this content:
cert = C:\netfree-ca.crt
Instead of the file path (C:/netfree-ca.crt) you should write the path where you saved the Security certificate.
Alternatively you can cancel the need for a certificate on the source sites of pip by adding the following lines to the above file:
[global] trusted-host = pypi.python.org pypi.org files.pythonhosted.org