Unable to download Foundation for Sites

When I try to download Foundation for Sites 6 I get an error on the following page: https://download.get.foundation/sites/download saying that my connection is not private.

Your connection is not private

Attackers might be trying to steal your information from download.get.foundation (for example, passwords, messages, or credit cards).

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download.get.foundation normally uses encryption to protect your information. When Google Chrome tried to connect to download.get.foundation this time, the website sent back unusual and incorrect credentials. This may happen when an attacker is trying to pretend to be download.get.foundation, or a Wi-Fi sign-in screen has interrupted the connection. Your information is still secure because Google Chrome stopped the connection before any data was exchanged.

You cannot visit download.get.foundation right now because the website uses HSTS. Network errors and attacks are usually temporary, so this page will probably work later.

Please see the pinned issue at [Installation] "Download Foundation" Button not working · Issue #12189 · foundation/foundation-sites · GitHub and the previous posts regarding this.