If you hear no dialogue after installing the pack, your console or launcher may need a hard reset to register the files.
The English Language Pack is a mandatory 15GB–20GB download for players who purchased regional versions or need to switch from a default language. While the audio quality is industry-standard, the installation process is often plagued by "Disc Read" errors and confusing menu navigation. ⚡ Key Pros & Cons Download Modern Warfare 3 English Language Pack