The website and documentation for older versions can be found from the archives page here.
libLCS is still in very early stages of development and might contain a lot of bugs. Moreover, the API can get redone a lot of times before a beta version is released. However, you are encouraged to use it and report bugs and issues, if any, and help in making LCS popular ;-) and reliable. Use the above links to download/install/start using the library.
Like the library itself, this website is also under constant development. Hence, bear with any incovenience or lack of information. Do feel free to write in your comments to me. For bug reporting, feature requests, or any other comment regarding libLCS and its website, you can reach me at my yahoo.com id sivachandra_br. You can also use the links provided on the libLCS project page on sf.net.