Short answer: rename the file to numpy-1.9.1%2Bmkl-cp34-none-win32.whl
to install it.
You can check what tags your pip
tool accepts for installation by running:
import pip; print(pip.pep425tags.get_supported())
In this case pip is incorrectly detecting your operating system to be 32-bits and the file you're trying to install was win_amd64
in its filename.
If you rename the file to numpy-1.9.1%2Bmkl-cp34-none-win32.whl
(which now contains the tags that are considered supported) then you can install the package. It's a trick because the file is still built for 64-bits but this allows you to install the package as intended.
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