Yesterday I wanted to review some old replays from S1 times. I found S1H and downloaded it. The problem is this old version cannot connect to master server since the IP changed I think. Is it possible to manually change the master server IP setting in that old LFS version in order to unlock it?

yep thats possible have a look in this thread http://www.lfsforum.net/showthread.php?t=22662

Thank you