If you are downloading subs for Season 4, you are likely a non-native English speaker, hearing-impaired, or watching in a noisy environment. This season, more than any other, relies on subtle dialogue and thick accents.
You can find and download the subtitles for the Game of Thrones Season 4 720p BluRay x264-ShAaNiG Game.of.thrones.season.4.720p.bluray.x264-shaanig Subtitles