Is it possible to downgrade to Smart or go back to Starter?
Upgrades have additional features to help improve your website, including extra pages, blog features, and finer graphic customization control. This also means it is not possible to downgrade to a lower version.
However, you can create a new free Starter site and quickly rebuild your website there. Then, if your original website uses a .simdif.com address or a domain name managed at YorName, you can give the address of the original website to the new one.