i think i downloaded everything you told me to to play ns. but when i click on a server online, it says your map differs from theirs everytime i click on a server, why is this happening and what do i do?

you could delete the map then and then download it from the server

See this forum for help with this issue.

http://www.unknownworlds.com/forums/in...showtopic=78063

Don't delete the map, fix the issue. Otherwise you'll just have this issue over and over.