The links provided on this page to download Gogs require IPv4 internet connectivity. Hosts that only have IPv6 connectivity are unable to download gogs.
In my particular situation I was attempting to download gogs from a server that only had IPv6 connectivity. I got around the issue by downloading gogs on another hosts that had IPv4 connectivity and then copying the file to the IPv6 only server.
Please consider enabling IPv6 on the download servers.