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The current stable release is Sozi 16.02 (February 2016):

Sozi is currently provided in the form of a zip archive. Unzipping the archive will create a folder with the same name. Linux and Windows users will run Sozi by launching the Sozi executable inside that folder. OS X users will find a subfolder that they can drag into their Applications folder.

Sozi 13

Sozi 13.11 is still available if you need it, but it is no longer maintained: