Sonic.exe Download [portable] -

// 2️⃣ Prepare request (HEAD to get total size, optional resume) long totalBytes = await GetContentLengthAsync(downloadUrl, ct); long existingBytes = 0;

await using var contentStream = await response.Content.ReadAsStreamAsync(ct); await using var fileStream = new FileStream( destinationFilePath, existingBytes > 0 ? FileMode.Append : FileMode.Create, FileAccess.Write, FileShare.None, bufferSize: 81920, useAsync: true); sonic.exe download

// ----------------------------------------------------------------- // Public API – call from UI thread (e.g. button click handler) // ----------------------------------------------------------------- public static async Task DownloadAsync( string downloadUrl, string destinationFilePath, IProgress<(long downloaded, long? total)> progress = null, CancellationToken ct = default) // 1️⃣ Ensure folder exists Directory.CreateDirectory(Path.GetDirectoryName(destinationFilePath)); // 2️⃣ Prepare request (HEAD to get total

private async void BtnDownload_Click(object sender, EventArgs e) btnDownload.Enabled = false; lblStatus.Text = "Starting download…"; long existingBytes = 0