IconBuilder 8.x is a complete re-write of the filter from the ground up. Everything about it has changed including the user interface, the workflow, even the underlying code is now Cocoa. We wanted to make it clear to both previous and new users that this version of IconBuilder would change the way you work and make your icon construction life easier, improving upon previous versions by leaps and bounds. So we moved from IconBuilder 5 directly to IconBuilder 8.
We've tried to anticipate most questions you might have. However, if you can't find the answer you're looking for here, send us your query and we'll answer it personally.