public static byte[] DownloadCached(this InstallerWindow ins, string url, string cached)
{
byte[] data = ins.ReadDataFromCache(cached);
if (data != null)
{
return(data);
}
data = ins.Download(url);
if (data == null)
{
return(null);
}
ins.WriteDataToCache(cached, data);
return(data);
}