pip install --only-binary :all: pycrypto
I suggest you could try to go to the link and download this.
https://visualstudio.microsoft.com/visual-cpp-build-tools/
Click on Help > Check for updates and update your visual studio
You need to update your IDE
your visual studio is outdated you can upgrade your visual studio at any time
C:Program FilesPython 3.5Scripts;
C:Program FilesPython 3.5;
C:WindowsSystem32;
C:Program Files (x86)Microsoft Visual Studio 12.0VC;
C:Program Files (x86)Microsoft Visual Studio 11.0VC
error: Microsoft Visual C++ 14.0 is required (Unable to find vcvarsall.bat)