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