The release is at http://sourceforge.net/projects/ttcplinux
You can obtain the source files by checking out the
CVS repository:
cvs -z3 -d:pserver:anonymous@cvs.ttcplinux.sourceforge.net:/cvsroot/ttcplinux co 2.4.2
or downloading the zip file:
http://west.dl.sourceforge.net/sourceforge/ttcplinux/2.4.2-ttcp-beta-1.0.zip
PS. You can find a detailed README.txt in the zip file.