If your PC's operating system language is set to Portuguese, Chinese, Japanese, or Korean, you will experience an issue installing your language pack on Steam.
To download the correct language pack:
- Launch Halo: Reach through Halo: The Master Chief Collection on Steam
- Navigate to Options & Career
- Navigate to Settings
- Navigate to Accessibility
- Navigate to Change Language
- Change the title's Voice Language to another language
- Save your selection
- Exit the build
- Re-launch the game
- Return to Change Language and select your intended language
- Save your selection
- Exit the build one more time
- Launch the game and your language pack should be installed