upgrading for 4.3 on Congo Jr.

Have you called your localized ETC Tech support yet?

The Upgrade Code is for if/when you buy additional output blocks - to upgrade your Congo (Jr) from 1024 outputs up towards the maximum of 6144.
I think you've clicked on "Software upgrade code...", instead of "Software Update"

The Congo upgrade process is as follows:

• Downloading the software (Congo430.exe)
• Rename the file "Congo.exe" - note that Windows XP hides the ".exe" bit by default.
  
• Put it on a USB memory stick in a folder called "Software"
• Boot the console to the Heartbeat screen.
• Insert the USB memory stick
  
• Click "System Settings"
• The "Software Update" button should now be active - click on it and follow the instructions.

If this doesn't work for you, call your local ETC Tech Support and we'll be happy to help you!