Proxy Settings
Use HTTP Proxy: Turns on\off the Proxy Settings.
Address: Enter the IP address that your Proxy uses.
Port: Enter the port that your Proxy uses.
Misc
Backup old definition file: Creates a backup of the current definition file before installing a new one
Suppress information dialogs during update: No notification message will be displayed asking for download confirmation or confirming that the download has finished
Buttons
Back: Returns to the Performing WebUpdate screen
Connect: Connects to the server, downloads and installs the latest definition file if one is available