If you are missing the sounds_ger.pck file and need to restore the German voice acting, here are the best approaches, ranging from the safest to more manual methods.
Default Path (Ubisoft): C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher\games\Assassin's Creed III\SoundData\pc\ . assassins creed 3 sounds ger.pck.rar
The user must first utilize software such as WinRAR or 7-Zip to extract the archive. This process yields the .pck file. If you are missing the sounds_ger