KiCost: Cannot run kicost on windows

Following the instructions here for windows: https://xesscorp.github.io/KiCost/docs/_build/singlehtml/index.html

I installed ActivePython-3.5.4.3504-win64-x64-404899.exe then opened a powershell and installed kicost :

easy_install kicost

Then running it I got the error:

kicost
You don't have the wxPython dependence to run the GUI interface. Run once of the follow commands in terminal to install them:
pip3 install -U wxPython # For Windows & macOS

Which I did, and now running kicost returns the following:

kicost
Traceback (most recent call last):
  File "C:\Python35\Scripts\kicost-script.py", line 11, in <module>
    load_entry_point('kicost==1.0.3', 'console_scripts', 'kicost')()
  File "c:\python35\lib\site-packages\kicost-1.0.3-py3.5.egg\kicost\__main__.py", line 215, in main
    kicost_gui() # Use the user guide if no input is given.
  File "c:\python35\lib\site-packages\kicost-1.0.3-py3.5.egg\kicost\kicost_gui.py", line 995, in kicost_gui
    frame = formKiCost(None)
  File "c:\python35\lib\site-packages\kicost-1.0.3-py3.5.egg\kicost\kicost_gui.py", line 493, in __init__
    self.set_properties()
  File "c:\python35\lib\site-packages\kicost-1.0.3-py3.5.egg\kicost\kicost_gui.py", line 805, in set_properties
    s=numbers.get_currency_symbol(currency),
  File "c:\python35\lib\site-packages\babel-2.6.0-py3.5.egg\babel\numbers.py", line 143, in get_currency_symbol
    return Locale.parse(locale).currency_symbols.get(currency, currency)
AttributeError: 'NoneType' object has no attribute 'currency_symbols'

Am I missing something?