Depending on which version of Mafia II you own (the original Steam version or the Definitive Edition ), the method for getting German audio or subtitles differs significantly.
: Steam will immediately begin a small update to download the German audio and text files if they aren't already present. Manual Fix: If Language Settings Won't Change mafia 2 german language pack
The localization features professional voice actors, including Alexander Brem (Vito Scaletta), Torsten Münchow, and Walter von Hauff. How to Change the Language to German Depending on which version of Mafia II you
The German language pack for , including full voice acting and text, can typically be activated via Steam or GOG Galaxy settings by selecting "German (Deutsch)" [1]. If language settings do not apply in the Definitive Edition, users can manually edit the settings.xml file in the profiles directory to force the language change [1]. Definitive Edition: Change in Steam Properties
steam_emu.ini or download the German files manually and place them in pc/sds.