I'm angry at toribot for ripping me off.
My bumpmap textures don't work.
Please help or I will remain sad and lonely all my life.
If my bumpmaps still don't work I will die.
Thank you.

Apparently they don't workj in the recent versions, but they'll be back soon working, so it's not a ripoff, it's just something that is not entirely working right now.

It will be up as soon as somebody from the dev fixes it.

what do they do different then the regular ones?

Wiki.com is a great resource for questions like this. Bumpmaps give something texture. It changes the way light affects objects.