The current version is Story Turbo – download from here >
The Apple Mac installers for v1.1 are here, they have a streamlined interface and some changes internally, so if you are on v1.0, get this version, it is better.
The Download page is the main place but they are here, with the Windows installers too.
Sign up is not required now to download the software. New features like a Social Media Forum and competitions are coming very soon. Let us know what you think of the changes.