I do not know if I am supposed to just install the latest realism mod for brothers in arms earned in blood or if I have to do them in sequence. the only reason I ask is because it can be hard to find the first one and kind of difficult to find the second, where as the third one is everywhere. I am new at this so i am sorry if this is a stupid question.
The Brothers in Arms: Earned in Blood patch download page is http://www.ubi.com/US/Downloads/Info.aspx?dlId=1416
If at all you have issues installing these please do contact technical support, the link is in my signature.