If you are getting a message about missing internet connection, it's surely a firewall problem, which is not granting online access to the installer, which is needed to get current files, both for the Addon Manager and for the Phantom.
Be sure you properly configure the firewall, be sure you are not using *two* firewalls at once, the Windows default and something else on top of it, and be sure the installer is able to download files at the end.