Upgrading CitectSCADA is not a simple thing to do because various factors need to be considered. Unfortunately, for this type of applications it's required to be a customers. There is a page where you can check for information about SCADA products.
Official website: http://www.citect.schneider-electric.com/scada/citectscada
You can download the latest SCADA, but it requires a username and password. It's best to log-in with your username and password and then check the upgrading options in the member's area.