OK.
AW2 is a Joint Operations Typhoon Rising mod.
If you've got JOTR you can install it right away.
Info on the Mod and downloads here.
http://www.tmw-teamwork-tmw.enjin.com/
If you don't have a copy of JOTR,
TMW can also help you there for about $5 US I think.
Contact
Chopperprop or any
TMW member, they're very helpful and will assist you in getting under way.