Greasy Fork is available in English.
YoYoutube-verktøy Alt i ett lokalt Last ned mp4, MP3
< Feedback on Youtube-verktøy Alt i ett lokalt Last ned MP4, MP3
I tried it in 4k and the download was successful. Keep in mind that the maximum quality of the video you mention is 4k. To be able to download in 8k, the video has to have that quality. You can check it in the video quality section.
The first level has been impossible for me to beat even after a whole day. Check out sansfight.org.
4K/8K WEBM Download failed
https://www.youtube.com/watch?v=ZYUMlm1BkXU
form https://p.oceansaver.in/ajax/download.php?...............
{success: false, message: "This format is currently not available"}