THIS VERSION ON SOURCEFORGE IS NO LONGER SUPPORTED and works only on Windows.
The Okapi Framework is a set of components and tools for localization and translation tasks. THE NEWEST JAVA-BASED VERSION OF OKAPI IS AVAILABLE AT: http://okapi.opentag.com/
The new version runs on Windows, Mac, Linux, etc.
I wonder why people still download outdated versions. Here - on SourceForge - the project is dead and links that redirect to the new repository are broken. Okapi Framework lives now on bitbucket.org/okapiframework and bintray.com/okapi.