The pack is not a mod or a patch. It is a collection of official Ubisoft audio files. Specifically, you are looking for two types of files:
Some users fix this by renaming their preferred language files to match the expected "english" filenames. : If you purchased a region-locked english language pack for far cry 3 link
Right-click Far Cry 3 in your library, select Properties > Language , and choose English . 2. Manual Configuration Fix (No Download Required) The pack is not a mod or a patch