Sparkbooth 4 was released on November 12, 2013. If you purchased a Sparkbooth license prior to the release date, you can upgrade your license at the upgrade page.
Premium includes additional premium features and may be used for commercial or business usage, or other money making activities.
Next, check which license type you have so you can select the correct "from" upgrade. If you do not know, go to the license recovery page to have your licenses emailed to you. The email will indicate the type of license you own. If the license type is just Sparkbooth, select any of the from Consumer upgrades.