I think the offical updates are around somewhere, but you won't be able to play multiplayer here that way. There has been a few patches to the game that everyone here uses and makes the two copies incompatible. One notable patch was the removal of the cheats, which were a problem in multiplayer. Another was some network changes to allow the game to work from behind routers (provided port forwarding was setup), but most people use Hamachi (virtual LAN) now anyways, so that doesn't really matter so much anymore.
Leviathan is definately still around.