FYI: The latest version is not available here

The OWA project actually ships a WordPress plugin with the official release, and it doesn’t appear that author who uploaded it to the WordPress.org repo is ever going to update/maintain it, so if you want the latest version of OWA, you should download it from the official site:

http://downloads.openwebanalytics.com/

http://wordpress.org/extend/plugins/owa/