Right-click the game in Steam > Properties > Installed Files > Verify Integrity of Game Files. This often pulls down missing language packs automatically. Where to Find the Lost Planet 2 PC English Language Pack
Drop the downloaded English files into the directory, overwriting when prompted. Launch the game via the LP2DX11.exe . A Note on Modern Compatibility lost planet 2 pc english language pack link
Before hunting for an external download link, check if you can "unlock" the English language already hidden in your files. Right-click the game in Steam > Properties >