OpenCV installation issue

[snippsat]

ImportError: DLL load failed: %1 is not a valid Win32 application.

This means that there problem with 32-64 bit,for you it's mean that's 64-bit when it should be 32-bit.
You most try to uninstall the wrong version you did installed first.

Requirement already satisfied: numpy>=1.11.3

Here you see that is already installed,this can be 64-bit version of numpy.
pip uninstall wheel-version