If the in-game menu doesn't save your preference, you can force the change in the config files: Navigate to C:\Users\[YourUser]\Documents\My Games\Far Cry 4 GamerProfile.xml with Notepad. Search for the line and change it to Language="english" Do the same for SelectedLanguage="english" if present. 3. Fixing Region-Locked Versions (Russian to English)
File mismatch or corrupted soundbanks. Solution: