Ran enus version and now engb version gives error message

I first ran the MoP client (which uses the enGB language pack) downloaded from the torrent on your site and it worked fine (aside from an issue which I later cleared up) and then downloaded a streaming client which uses the enUS language pack. Now the first client I downloaded is trying to look for the "Data\enUS\locale-enUS.MPQ" file instead of the enGB files it should be looking for. I made no changes to any files in the folder for that client and I searched for registry keys that might have changed but couldn't find any. If anyone knows what setting was changed by the enUS client to cause the enGB client to look for the wrong files please let me know so I can correct this.

Those settings should be in Config.wtf file in WTF folder.

The config.wtf file is unchanged. It is the same as when first downloaded so that is not the issue.