No theme that is adapted and licensed to run on WordPress.com software can be exported and used on any other software. You must contact the theme designer directly and purchase a version that runs on WordPress.ORG software.
Note: Premium Themes that are licensed for WordPress.com use only cannot be transferred to self-hosted WordPress.org sites. http://en.support.wordpress.com/themes/premium-themes/
Provided you are logged in under the same username account that purchased the upgrades, you ought to be able to request a refund from your dashboard > Store > My Upgrades
WordPress.com provides a 30-day refund on all upgrades except Domain Registrations, Domain Renewals, and Guided Transfers.
Note: It takes from 1 - 2 weeks for the refund to be received.