UnZip and install the "River Racing" folder to the following location:

{installation path}\IL-2 Sturmovik Battle of Stalingrad\data\Multiplayer\Cooperative

Run these missions by creating a server in Multiplayer, Cooperative mode.  You will likely need to set up port forwarding on your internet router in order for others to join the server and download the mission.

Fly low, fly fast and have fun!!!!

Stoopy