Internet connection required to install (even though internet is working)

Trying to install X7 on a replacement computer, (original died), and I keep getting 'An internet connection is required to install......'
I DO have internet, turned off all antivirus, tried multiple times to install and still get this message even though I have internet and can access any web site I want. Note: there is no firewall either.... (and the message to 'allow access to setup.exe' is vague.... if I had a firewall you generally need a path as well if allowing access to a specific file.
Anyone have any ideas why I can't install?