is currently reachable for me, but there is a problem with the https configuration so it is flagged as not secure. Firefox says the site does not support encryption. Many downloaders and browsers refuse to download files under these circumstances, but encryption of public files should not be necessary. Https is, however, still important to ensure that you are connecting to the real updatecenter. Some firewalls may block connections under these conditions. If you are behind an enterprise firewall you may need to get advice from your IT people.