The command you suggested have worked for me (win7, python 3.4), thank you!
I have tried it just on two newly downloaded wheel packages, because I had installed numpy, kwant, ipython, etcetera already before (one by one).
BTW, 2to3 converter does not exist in my windows installations, nevertheless python scrips are so far interpreted correctly but apparently six-1.10.0-py2.py3-none-any.whl package is need.
I just had the idea that the lack of wildcard support in the default Windows shell could be worked-around using Python's own means. Could someone who has access to a Windows machine please try whether the Windows installation instructions  work when the command
pip3 install --no-deps *.whl
is replaced by
python3 -c "import pip, glob; pip.main(['install', '--no-deps'] + glob.glob('*.whl'))"