can't install stable version

[lee-sooji]

The error message is shown as below:

Invalid requirement: --allow-external theano
pip: error: no such option: --allow-external

As an alternative, when I downloaded blocks stable folder and tried "python setup.py install",
then there comes a problem with progressbar2 as below.

Couldn't find index page for 'progressbar2' (maybe misspelled?)
Scanning index of all packages (this may take a while)
Reading https://pypi.python.org/simple/
Download error on https://pypi.python.org/simple/: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:661) -- Some packages may not be found!
No local packages or working download links found for progressbar2
error: Could not find suitable distribution for Requirement.parse('progressbar2')

Could somebody help me?