If you use , you can download the subtitles directly without leaving the app: Open the episode in VLC. Go to the View menu and select VLSub .

To download subtitles for (titled "Happy Valley"), you can use several dedicated subtitle databases that host .SRT files for this series. Official & Primary Sources

: As the original broadcaster, Apple TV+ provides official, perfectly synced multi-language subtitles and closed captions directly within their player. Dedicated Subtitle Databases