Steam will automatically begin downloading the necessary English files. Note that this may be a large download as it replaces significant portions of the game data.
locked in a different language (often the Russian or Polish retail versions), "downloading" an English language pack usually involves a manual workaround because these specific regional versions often lack built-in language switching. Core Methods to Get English Language Steam Properties (Official): Cod Advanced Warfare English Language Pack Download
To download and install the English language pack for Call of Duty: Advanced Warfare Cod Advanced Warfare English Language Pack Download
have a "Change Language" option within the in-game settings menu. Regional Locks Cod Advanced Warfare English Language Pack Download