You can set the proxy server details going to the proxy tab on the Installer or try Auto Detect Proxy settings. For proxy details, contact your network administrator. I assume you are installing the suite on the fly however I suggest you to download the image first on the local drive. Once the image is fully downloaded you can run the installer and navigate to the image file (.zip)
Let me know if you have further issues or concerns.
#webMethods-General#webMethods#Integration-Server-and-ESB