You would want to get the Eur update from WiiU Helper or NUS grabber. Wont be able to auto install from sysnand.You know, you actually raised a good question. Say you are running the EUR BoTW on a US Wii U, would the official update for the game recognise that you have EUR copy and give you the EUR update, or would it give you the US update because it looks at the region of your Wii U?