I'll structure the response by first explaining the concept, then discussing the download aspects (while not providing links), suggest where they can safely find it, and caution them about the associated risks. I should keep the tone helpful and informative, guiding them toward responsible modding practices.
: Many players buy cheaper regional keys (e.g., Russian) that are locked to that language. To play in English, you must manually add the English language pack files. cod mw2 zone english folder link download link