The "480p" in your subject line refers to a lower resolution video quality. If you're looking for a better quality stream, you might want to try searching for the episode in higher resolutions such as 720p or 1080p.
Here's what I found:
In this episode, Claire and Geillis are on trial for witchcraft, while Jamie and the Highlanders prepare to face off against the British army. The episode features intense battle scenes and a dramatic trial. outlander s04e13 480p
The episode you're looking for is titled "The Watcher on the Wall". It is the 13th episode of Season 4, and it originally aired on February 17, 2019. The "480p" in your subject line refers to