1. Get the exact URL of the video. Therefore enter keepv.id and paste the URL. After that select the resolution that you want to download. Open the video on it's source URL by clicking on the button. Everything was successful, when the URL ends with a video-specific ending like .mp4.

2. Copy the URL from your browser and download the video with wget via CLI. Alternatively you can also download the video directly via your webbrowser.

Second option to get the exact video URL for PeerTube videos:

Enter the network tab when inspecting the page, then select any URL where the mediatype is mp4. It doesn't matter if the URL contains any like fragmented. When opening the URL the full video will be loaded, this also works when using wget.