If you already installed AvP and cracked the steam_api.dll, download the non cracked and replace it:
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3. Download Zero Gear Demo
4. Fine the Zero Gear batch file(C:\Program Files (x86)\Steam\steamapps\common\zero gear), right click and edit, and replace everything in it with this:
cd /d "C:\Program Files (x86)\Aliens Vs Predator"
("replace the path inside the parentheses to where you installed the game to, but do not remove the parentheses")
5. Go to your Aliens Vs Predator folder and open the steam_appid text document and replace the number with 18800.
7. Go to your Steam and start the Zero Gear Demo
Now just go to the multiplayer in-game and browse for games. If you don't see any games either no one is hosting or just keep trying. It took me a little to get it working, I kept going to multiplayer, browsing games, exiting AvP and kept repeating it for a bit until it started to work and now it's always working.