Version 0.13.0 releaed recently and starts using the Python "enum" module. That module was introduced in Python 3.4, and there is a backport package available that supports Python 2.7. The issue is ...
File "C:\workspaces\jdengel-PXI-py27_64bit_prototype\Python27\lib\site-package alabaster==0.7.9 appdirs==1.4.0 argparse==1.2.1 astroid==1.0.1 babel==2.3.4 backports.ssl-match-hostname==3.4.0.2 ...