Digital distribution platforms sometimes default to your regional language during installation. In other cases, highly compressed game repacks strip out additional languages to reduce the initial download size.
This usually happens when there is a mismatch between the game version and the language file version. Ensure your base game is updated to the same version as the language pack you downloaded.
If you own the game on Steam , you do not need to download files from third-party websites. Steam can automatically fetch the exact high-quality audio and text files required.