.. blogpost::
    :title: Issues with installation from source on Windows
    :keywords: Windows, win32, pip
    :date: 2021-01-04
    :categories: installation
    :lid: blog-install-issue-windows

    The installation may fail on Windows when the model
    is compiled from the source. I could not find a particular
    reason. It works when :epkg:`numpy` is uninstalled
    before running `pip install cpyquickhelper`.
    Otherwise, this is the kind of error which appear:

    ::

        AppData\Local\Temp\pip-install-neuk85qw\cpyquickhelper_478c84dd0c2549f4bbfec94c5d99c7f8\cpyquickhelper\numbers\slowcode.cpp :
        fatal error C1083: Impossible d'ouvrir le fichier g‚n‚r‚(e) par le compilateurÿ: ''ÿ: Invalid argument

    Or:

    ::

        RuntimeError: The current Numpy installation ('c:\\xavierdupre\\venv\\py38\\lib\\site-packages\\numpy\\__init__.py')
        fails to pass a sanity check due to a bug in the windows runtime.

    This happened on a virtual environment.
    The best is probably to download one of the
    `artifacts from appveyor
    <https://ci.appveyor.com/project/sdpython/cpyquickhelper/build/artifacts>`_.