Norton Setup: invalid certificate on download

I receive a warning from Safari (see attached file) warning that an Akamai server is trying to impersonate buy-download.norton.com. This happens every time I try to download Norton 360 on my Mac.

Is this normal? I could be downloading malware from a site that hijacked buy-download.norton.com DNS, therefore I did not proceed with the installation.

This should never happen in a service provided by a security product company, right?

https://www.ssllabs.com/ssltest/analyze.html?d=buy-download.norton.com