Добавьте файлы проекта.

YandexMusic.API/Common/DataDownloader.cs

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+using System.Net;
+
+namespace YandexMusic.API.Common
+{
+    /// <summary>
+    /// Загрузчик файлов по ссылке
+    /// </summary>
+    public class DataDownloader
+    {
+        private AuthStorage authStorage;
+
+        private async Task<HttpContent> GetResponseContent(string url, HttpCompletionOption httpCompletionOption = HttpCompletionOption.ResponseContentRead)
+        {
+            HttpRequestMessage message = new(new HttpMethod(WebRequestMethods.Http.Get), url);
+
+            HttpResponseMessage response = await authStorage.Provider.GetWebResponseAsync(message, httpCompletionOption);
+            return response.Content;
+        }
+
+        public async Task<Stream> AsStream(string url, HttpCompletionOption httpCompletionOption = HttpCompletionOption.ResponseContentRead)
+        {
+            HttpContent content = await GetResponseContent(url, httpCompletionOption);
+            return await content.ReadAsStreamAsync();
+        }
+
+        public async Task<byte[]> AsBytes(string url)
+        {
+            HttpContent content = await GetResponseContent(url);
+            return await content.ReadAsByteArrayAsync();
+        }
+
+        public async Task ToFile(string url, string fileName)
+        {
+            using Stream stream = await AsStream(url);
+            using FileStream fs = File.Create(fileName);
+            await stream.CopyToAsync(fs);
+        }
+
+        public DataDownloader(AuthStorage storage)
+        {
+            authStorage = storage;
+        }
+    }
+}