Well, from that, it looks like your version of curl does not have TSL built in. Check by running
Here is what mine shows:
curl 7.54.1 (x86_64-pc-win32) libcurl/7.54.1 OpenSSL/1.1.0f zlib/1.2.11 WinIDN libssh2/1.8.0 nghttp2/1.23.1
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp scp sftp smtp smtps telnet tftp
Features: AsynchDNS IDN IPv6 Largefile SSPI Kerberos SPNEGO NTLM SSL libz TLS-SRP HTTP2 HTTPS-proxy
Does yours also have the “OpenSSL” bit?