Normally there is a link near the top of the article which provides a download of the associated code - it's usually just above the "Introduction section:
https://www.dropbox.com/s/0tlnlnm9pji5iul/Screenshot%202014-07-15%2007.24.02.png[
^]
This should download a ZIP file for you.
If there isn't an obvious one, then we would need a link to the article to identify where it is on that specific document.
Do note that some articles do not include a download - it isn't compulsory!