Hi Kutti,
The TELEMAC-2D user manuals are currently updated for version 6.2 and will be available soon. If some information are common with TELEMAC-3D, the TELEMAC-3D user manuals are now available for version 6.2.
To get the validation test cases, since version 6.2, you are asked to use svn and download the directories, not a zip file : please read the "The details of the TELEMAC SVN repository" section in Download section, then Sources: SVN or directly
www.opentelemac.org/index.php/sources-svn
Hope this helps,
Chi-Tuan