You can get the latest development version of cssed, following the instructions at the Source Forge's Project page.
Once you have got a working checkout of cssed from CVS, you can update it with the command:
Take into account that each time new files are added some builds script may change. If your build script stops working after a CVS update, you can rebuild it with two scripts in the root folder of the cssed distribution:
autogen.sh: it uses a sort of brute force rebuilding every build script in the source tree.
bootstrap: it tries to rebuild only the needed files.
To run it, simply cd into the root cssed distribution folder and type:
Both work and choosing one of them is up to you.
Mac OS X users: do not to use bootstrap as it may mess up the source tree.