Hi ,
Do you have the full version of Quest Web Parts for SharePoint or did you download the free discussion view web part from sharepointforall.com? If you download the free version, then the "Create Complex Category Index List" functionality will not be useful for you anyway because the complex category functionality requires the qListForm web parts to work fully. But if you have the full version of Quest Web Parts for SharePoint, please open up a support ticket through http://support.quest.com.