at the beginning it did not work for me for three reasons:
1. bad theme
2. conflicts. i had a million plugins installed, most of them useless and it's bad for seo. i'm glad i had to deactivate them all, i reactivated only very few i really needed.
3. i didn't follow the tutorial, i didn't do the things the right way.
so what i did was, i deactivated every plugin, (including hello dolly ...).
and then i started again with the tutorial in my hand.
followed every word in the tutorial, and it worked.
i deleted really everything, created category, created product, define as variable etc ...
If there's no conflict - it works fine. no doubt.
try to do it all again from zero. print the tutorial and follow it.
when you say "not working", what is not working?
can you create a category? can you create a product? can you set it as variable? did you create attributes? did you click "link all variations"?etc. etc. etc...
at what point did it stop doing what it should? do you get an error message?
it MUST work. just be thorough and precise.
AND ABOVE ALL, MAKE SURE YOU USE A THEME THAT SUPPORTS THE SHOPPING CART YOU ARE USING.
i normally use many free components: plugins, themes, fonts, graphics etc. but for the shop i went and bought a relatively expensive theme (60$) and it works like magic. (and it's beautiful, much more than the free ones).
hope that helps