The Web Server components of WebCenter can be installed from a link on the WebCenter installation media.
This should be a different machine than the one currently running the installation.
You cannot configureWebCenter with IP addresses. If the web server is not able to find the application server via name resolution, you can map the IP address of the application server and the hostname of the application server in the C:\Windows\System32\drivers\etc\hosts file. For example: 10.31.140.69 myappserver.
If it installs, click Continue when it is done, or wait 10 seconds for the process to continue automatically.