Quite complicated, I hope that the current version can be played via LAN directly. The steam thingy always update for unknown reason sometimes and it takes some time just to play a skirmish game >.<
That not should be called a way to do it TBH, you just need to replace one file to make this possible. With this method you complicate things a lot .
I just figured it out! you just replace FactionFix.dll with the original one.it worked for me i hope it work for you!
you just replace the eastern front 2.xx factionfix.dll with the relic CoH 2.602 original one.