To do that you will need the original client AND the original server code AND the original database data.
The first can be found online (anyway I have it). The second is hard to reproduce as we migrated between different systems for source code management, and I think the original one is now gone. The third is pretty hard to reproduce without a backup, and my oldest backup is around 2004, so not really the first release.
Anyway what about PlaneShift 2D then? In that case the client I still have, the server I'm really not sure.