The ns_install_v3_b1.exe file you have requested: Modifications / natural selection / v30 Beta 1 / Natural Selection Beta v3.0 Beta 1 Client - 7.06mb 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:

v3.0 Beta 1 of the Natural Selection modification for Halflife.

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