CDONTS was depreciated with Windows 2000, and replace with CDOSYS. There is nothing to install with CDOSYS as it is built in to Windows Server and you can't install a different version.
The reason for being CDOSYS, CDOSYS TLS, CDOSYS SSL in Web Wiz Forums is for different settings within CDOSYS.
CDOSYS is for connecting to the mail server in plain text.
CDOSYS TLS is for using modern TLS encryption to connect to the mail server.
CDOSYS SSL is for using an SSL connection to the server. SSL is pretty much depreciated these days, so don't use this setting.
If Classic ASP was not installed on the server, then Web Wiz Forums would not run at all, and not just for sending emails.
CDOSYS is quite old, if you can get components installed on the server then I would recommend Persists AspEmail.