Yes this is a illegal install of 10.4 Server. I'm just wanting to mess around with a server OS and see what I can break and get working. I found a serial online and it worked and everything seemed fine. When i opened the server admin program it said my serial was invalid. Why would it let me install if it is invalid? I haven't hooked it up to the internet and the only other computer on the network is a laptop running 10.5, also no internet. Is there a way around this?