Sorry to hear you’re having trouble with your purchase. In case you haven’t already, be sure to post your questions in the author’s support forum: http://digitalzoomstudio.net/support/
Also, there seem to be a lot of FAQs on the product page, not sure if those would be useful (some of them seem to explain potential errors).
If they aren’t able to resolve the issues, you can contact Envato support here: http://themeforest.net/support . They will investigate, and if they find the plugin is broken/not working as described, they will provide a refund.
I did notice that the plugin is only listed as compatible with WordPress 3.0 - 3.2. I wonder if the issue is WordPress 3.3?
Best of luck with your project!