If you are using a version of the game where the English pack isn't showing up in the menu, you may need to manually verify the folder structure. Within your game directory (usually steamapps/common/Call of Duty Advanced Warfare ), you should see a folder named . Inside this folder, critical files include: common_en.ff code_post_gfx_en.ff localized_english_iw6.iwd (and similar variants)
For many users, particularly those who purchased physical or digital copies in regions like Russia or Poland, the English language is often omitted from the base install. This "region-locking" of language data means that even if a console's system language is set to English, the game may default to a local dialect without an in-game toggle. Steam Region Restrictions
Usually SteamApps/common/Call of Duty Advanced Warfare .