RDS5.5 final? Where did you get this "final"? Suspicious naming convention.... If you OWN a legal, registered (to you) copy of Ray Dream Studio 5.5, you will be able to upgrade (through MetaCreations directly) to Carrara 1.0 for USD$100.00. As for your second question... what are you asking? Yes the interface changes. I don't understand what it has to do with the price. scratching temple -Robert