I believe that the settings for odalaunch are stored in the registry in Windows. If this is the case, the launcher may be pointing to an old install of Odamex (in this case, Oda 0.6) when trying to join a server. Go to settings > file locations > Odamex Path and make sure that the path to your current 0.6.2 install is correct. If that fails, come back and let us know.