Before starting, to prevent data loss.
Once the files are replaced, you may need to "trick" Steam into keeping them:
Use a tool like 7-Zip or WinRAR to extract your downloaded English language pack. Clean the "Main" Folder: Before starting, to prevent data loss
Delete the russian folder and replace it with the english folder from your download.
Copy the localization.txt file from the language pack and overwrite the one in your main game directory. Copy the localization
Because the official Steam version may not provide these files for region-locked copies, players often use community-hosted archives. A standard English language pack for Black Ops 2 includes:
Open the main folder and delete all files labeled localized_russian . Paste the localized_english files from your download into
Paste the localized_english files from your download into this folder. Go to the zone folder in your game directory.