I think you need to enter your new credit card information and expiry date, and then when you make your first purchase with it I think you might have to wait for a download link while they verify the new card.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi