I played this all the way through with MMod 1.3 and found a couple of issues. Mounted guns don't work... you can fire them but there's no projectiles or impacts meaning they're useless. Luckily this isn't game breaking. Then there's the missing hunters as stated previously by Guest, which doesn't allow you to proceed. I had to noclip through the door that's meant to open upon their death. Other than that, it works fine.
EDIT: I've since tested it and the above mentioned gameinfo.txt fix addresses both the mounted gun and missing hunters issues.
Flyboy/hl_freak
Gary joined
My name is Gary Wright and my aliases are Flyboy and hl_freak depending on what area I'm participating in. I'm big into military simulations - especially attack helicopter ones (this is where I am known as 'Flyboy') and I'm a massive Half-Life series fan (this is where I am 'hl_freak').