Hi, I got the same problem. I got the EU game client, I am using a credit card issued in Asia, but I am currently stationed in another part of Asia for work.
I am getting constant Error code: 601
I tried a lot of things, but it doesn't work
I went online and got a EU region game card code, entered it in, and worked.
I don't want to advertise any particular sites, but I am sure you'll find some with google.