You’ll need the original game which can be found here
/viewtopic.php?t=261312&highlight=
Adds the Sopwith Camel, Albatros D.III, Albatros D.Va, and Fokker Dr.I, and new campaigns set over the Cambrai sector of France.
http://rapidshare.com/files/242695669/WWI_exp1.part1.rar
http://rapidshare.com/files/242718801/WWI_exp1.part2.rar
http://rapidshare.com/files/242722339/WWI_exp1.part3.rar
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