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http://www.moddb.com/mods/half-life-decay
In general it should work quite well but you may encounter some minor bugs (when I played with a friend there was one map where you could interrupt a Barney sequence and that broke the whole progress in the map) so the only solution there was to play it again.
That is why I linked to the mod because right now it is the only way to play it.
The Hardcore Anti-Rush servers have Half Life: Decay campaign as an option in their voting map. Good luck getting majority to vote for it but it is there. I've been wanting to download it myself.