public static void Download(string id, string url, string[] destination, string key, string jsonData, bool resumeOK)
{
DownloadDoneCallback doneCallback = null;
Download(id, url, destination, key, jsonData, resumeOK, doneCallback);
}
public static extern void Download(string id, string url, string[] destination, string key, string jsonData, bool resumeOK, [DefaultValue("null")] DownloadDoneCallback doneCallback);
extern public static void Download(string id, string url, string[] destination, string key, string jsonData, bool resumeOK, DownloadDoneCallback doneCallback = null);
