Many beginners don't know how to download source code from open source projects,sourceforge and google code etc.
CVS client is a software which is used to check out from sourceforge
Software needed : SVC client like tortoise svn
install in windows
download a subversion client like tortoise and install
http://www.tortoisecvs.org/download.shtml
In ubuntu:
install
sudo apt-get installcvs
enter the given checkout instruction on client and you will get all source files.