using System;

​

using YoutubeExplode;

using YoutubeExplode.Videos.Streams;

​

string url = "https://m.youtube.com/watch?v=kCPQUAtMZR4";

YoutubeClient client = new();

var manifest = await client.Videos.Streams.GetManifestAsync(url);

string streamUrl = manifest.GetAudioOnlyStreams().GetWithHighestBitrate().Url;

Console.WriteLine(streamUrl);