Here is a link for the 1.3.37a version : 126.96.36.199//MW2_AlterIWnet_1.3.37a.rar
Remembrer that this patch is independant from alteriwnet, you can play it in LAN or over the internet (if you forward the port 28960), but it is NOT linked to any other server than yourself.
Change that can and can't be made :
AltnerIwnet.ini, don't change the server line, it is always 127.0.0.1, the local Iwnet Server. You can also change your pseudo with the Nickname's line.
Always launch the local Iwnet server first with IwnetServer.exe and then iw4mp.exe.
If you play in LAN you don't need to forward your port but if you play over the internet, the guy who host the game must forward the port 28960.
To host a game, start a private match lobby (you don't have launch the map).
To join a game, start iw4mp.exe, then go back to the desktop, access alteriwnet console and type "connect HOSTINGGUY_IPV4" ^^
There is EAM in the folder, it will allow you to go to lvl 70 with all weapon, etc... (as you can't lvl up in private this is very usefull)