Advanced users can manually change the "Locale" value in the Windows Registry at HKEY_LOCAL_MACHINE\SOFTWARE\Maxis\The Sims 4 .
Typically supports all 17–18 official languages, including English, Simplified Chinese, Traditional Chinese, French, German, and Russian. 3DMGAME-The-Sims-4-Language-Selector-Xuanze-Tools
Based on community guides from platforms like GameMale , the typical installation and usage process involves: Advanced users can manually change the "Locale" value
Go to Game Properties > Advanced Launch Options and select your language from the dropdown menu. and navigate to the Language tab.
Changes the language without requiring a full re-download of game assets.
Right-click the game in your library, select Properties , and navigate to the Language tab.