The Studiometry Archives contains the dowoload files for previous versions of Studiometry. Both the Mac and Windows versions can be accessed at this site. If you want to downgrade to an older version or accidentally upgraded, you can download the version of Studiometry you wish to have from the webpage listed below.
Studiometry Archives Webpage: http://www.oranged.net/software/download/archives/
Version History Webpage: http://www.oranged.net/studiometry/versionhistory.php