I don't know what info your looking for but i think is this one.
How to Update your retail copy of Assault Squad to 1.90.5 whit Steam.
One - go to Steam
http://store.steampowered.com/ and look on top it will say (Install Steam)
Two - after is done Installing Steam make a account and when your done making a account with steam login in the steam software and look for (GAME) and go to (activate a product) just hit next and agree and then enter your CD-key and hit next.
Three - Go to (Game) again and go to (view games library) and play Men of War Assault Squad from Steam and it would install a steam version for you as well as auto update the newest patch.
hope that the information your looking for.