2021-01-04 Issues with installation from source on 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 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.