No need to put fuel on fire everyone, I'm water, and this new friend called oxygen is just searching a way to play with people.
We agree to disagree.
A group/clan called TBBC has release the latest Master Server there is to date where most of the people are playing.
You can download it via the link JP gave you.
If you want to play Primal Hunt, I advise you to watch at Lucifero's link.
If you don't have primal hunt, there's the X-Man-team who released a version of the full game that includes AVP2 + Primal Hunt with all updates and custom mappack + SP mappack and the toolkit.
It is great, free, and full of documentation about the game. With this you should be able to PLAY SP, MP and even come up with your own Game modification and if you got time you could learn how to create map for the game.
There are a loads of mods you can also download freely and play with available on both http://www.avpunknown.com/
The most famous Mappack is UMP2 with all its update.
If you haven't tried, I advise you to play some custom sp map like the Fear Series from PsyKore or Under The hunter's moon from Windebieste. If you need help on how to download and play, post here, people are always happy to help
Have fun, don't hesitates to ask for more informations.