Fixed linux dependency donwloads, fixed slow download speeds

Editor/Core/PSXAudioConverter.cs

@@ -74,29 +74,18 @@ namespace SplashEdit.EditorCode
                 string tempFile = Path.Combine(Path.GetTempPath(), archiveName);
                 EditorUtility.DisplayProgressBar("Downloading psxavenc", "Downloading...", 0.1f);
 
-                using (var response = await _http.GetAsync(downloadUrl, HttpCompletionOption.ResponseHeadersRead))
+                using (var client = new System.Net.WebClient())
                 {
-                    response.EnsureSuccessStatusCode();
-                    long? totalBytes = response.Content.Headers.ContentLength;
-                    long downloaded = 0;
+                    client.Headers.Add("User-Agent", "SplashEdit/1.0");
 
-                    using (var fs = File.Create(tempFile))
-                    using (var stream = await response.Content.ReadAsStreamAsync())
+                    client.DownloadProgressChanged += (s, e) =>
                     {
-                        byte[] buffer = new byte[81920];
-                        int bytesRead;
-                        while ((bytesRead = await stream.ReadAsync(buffer, 0, buffer.Length)) > 0)
-                        {
-                            await fs.WriteAsync(buffer, 0, bytesRead);
-                            downloaded += bytesRead;
-                            if (totalBytes.HasValue)
-                            {
-                                float progress = (float)downloaded / totalBytes.Value;
-                                EditorUtility.DisplayProgressBar("Downloading psxavenc",
-                                    $"{downloaded / 1024}/{totalBytes.Value / 1024} KB", progress);
-                            }
-                        }
-                    }
+                        float progress = 0.1f + 0.8f * (e.ProgressPercentage / 100f);
+                        string sizeMB = $"{e.BytesReceived / (1024 * 1024)}/{e.TotalBytesToReceive / (1024 * 1024)} MB";
+                        EditorUtility.DisplayProgressBar("Downloading psxavenc", $"Downloading... {sizeMB}", progress);
+                    };
+
+                    await client.DownloadFileTaskAsync(new Uri(downloadUrl), tempFile);
                 }
 
                 log?.Invoke("Extracting...");