plugin not working, revert back to old wp?

i have updated to the new 3.3 wp, and downloaded a plugin called RBX gallery.

I can’t get the plugin to work properly, it only displays the large image and not the thumbnail images. I want to use it showcase a product. I can’t find another plugin that will do what i want it to do apart from this one.

I think the plugin is not working because of the compatibility to the new 3.3 wp. Is there a way I can reverse the update?

thanks in advance