Extract your downloaded language pack. Move all .iwd files (usually named localized_english_iw00.iwd through iw06.iwd ) into the game's main folder.
To get the necessary files, you can use these reputable community sources: call of duty 4 modern warfare english language pack download
If you are using the Steam version, it may try to re-download the original language files. You can often prevent this by turning off automatic updates or using the "English" setting in Properties > Language if available. Extract your downloaded language pack
This often occurs if some files are missing or if you haven't renamed files to match what the game expects. For Russian versions, you may need to rename the new localized_english_... files to localized_russian_... to "trick" the executable. You can often prevent this by turning off
If your download includes a zone/english folder, place it into the zone directory of your game.
Right-click the game in Steam and select Manage > Browse local files .
If you have a version of locked in another language, you can switch it to English by manually replacing specific localization files or using a community-made language pack. Official language options on Steam are sometimes restricted by region, making manual installation necessary for many players. Where to Download the English Language Pack