You can download one of the official releases or the latest snapshot from the CVS server.
Download the release
The releases can be found on the standard SourceForge project page which will redirect you to the SourceForge mirrors.
Download the lastest SVN snapshot
For the latest snapshot, you have to use SVN, according to the instructions from this page, under the Subversion Access section. Use lastbash for the trunk.
Please use the repository browser to have an image of the repository structure.