This product is marked as discontinued because the official website doesn't exist anymore. I have accessed the URL which seemed to be the developer's page, but a generic page is displayed instead. You will have to use another application, because this one isn't available.
For example, the POCO C++ offers the same functionality as the Mabry Internet Pack (FTP, HTTP, SMTP development libraries) and it can be downloaded using the following link: https://sourceforge.net/projects/poco/
