Some packs are "text only." You need a "full audio" pack which is significantly larger. Ensure your download is at least 1.5GB.
While the process involves digging into system folders and registry edits, the reward is a seamless English experience. However, always backup your files, scan your downloads for viruses, and respect the game's licensing.
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To change the language of Call of Duty: Black Ops 2 from Russian to English, you must manually replace localized files within the game's directory, as many regional versions lack a built-in language selection tab in Steam.