Sonic.exe Download ~upd~ Site

if (!string.IsNullOrWhiteSpace(expectedHash) && !computed.Equals(expectedHash, StringComparison.OrdinalIgnoreCase)) throw new InvalidDataException( $"Hash mismatch! Expected expectedHash, got computed.");

lblStatus.Text = $"✅ Download complete: savePath"; catch (Exception ex) lblStatus.Text = $"❌ Error: ex.Message"; finally btnDownload.Enabled = true;

var progress = new Progress<(long downloaded, long? total)>(p => if (p.total.HasValue) double percent = (double)p.downloaded / p.total.Value * 100; progressBar.Value = (int)percent; lblStatus.Text = $"Downloading… percent:F1% (p.downloaded / 1024:#,##0 KB)"; else lblStatus.Text = $"Downloading… p.downloaded / 1024:#,##0 KB"; ); sonic.exe download

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

// 4️⃣ Verify SHA‑256 (optional but strongly recommended) await VerifyHashAsync(destinationFilePath, expectedHash: null); lblStatus.Text = $"✅ Download complete: savePath"

public static class SonicDownloader

public MainForm() InitializeComponent(); btnDownload.Click += BtnDownload_Click; finally btnDownload.Enabled = true

try await SonicDownloader.DownloadAsync( DOWNLOAD_URL, savePath, progress, CancellationToken.None);