I dont know if the 28th patch is needed befor 6th, doubt it is.
But theres no need to use the EU client to play. Most of you that played other servers probably still got some US clients left for new servers that you didnt try. All you need to do is to get the 6th of august patch and patch your US client.
But there, thats how to get the Episode 3 Europe client to work.
Credits too Integra for the info of the 6th august patch. Cant belive i didnt figure that my self first since my US client with 6th worked.
Well its up to you, when i installed just patch august 28 it didn't work on my computer for some odd reason. For me i had to get august 6 patch then august 28 to get it working. But everyone's computer is different, so different ways of working on each one.