enUS wow, and enEU burning crusade/how to fix

[deemeetar]

I have enUS basic wow version and enEU burning crusade. Can i somehow change the language of the basic wow, 'cos like this i cant install Burning crusade. Any solutions?

[Kalos]

It's not just an issue of language. There's a different patch cycle and sometimes even slightly different patch data between the two regions, and the key from BC isn't designed to be used for any region bet that which it was made for, it simply won't be validated. This won't work, on so many levels. With BC as cheap as it is, just buy a proper one for your region.