The version number for your copy of SeedCode Hierrachy can be found at the bottom of the Admin tab or inside the hierarchy in the field HierarchyInterface::VersionCalc.
The latest version is 7.4 (10/10/2008). This continues development of the documentation and introduces multiple hierarchies.
Version 6.7 (10/6/2008). Private Beta.
Version 6.0 (9/18/2008). Private Beta.
Version 4.8 (9/1/2008). Private Beta.