The nsv30b4patchdedicatedserver.zip file you have requested: Mods / Multiplayer / Natural Selection / Releases / Patches / Server Patches / Natural Selection v3.0 Beta 4 - Dedicated Server - 37.58mb is not available. Perhaps try browsing all files for the game Half-Life and upload any files you want to share or are missing. This is the only information we could locate:
Fourth beta release of the dedicated server files for Natural Selection v3.0. The update updates itself from any prior version, but Beta 1 is required to be installed.