For applications like this one, updates are provided through an Updater. To check for updates, go to Help > and look for Check for updates. Some apps are configured to check for updates when they're started.
Make sure that your firewall allows PaperPort and all its modules to access Internet. There could also be the problem with their servers being in maintenance or having issues.
Get in touch with the developers to obtain an official status about update procedure and availability: http://www.nuance.com/support/paperport/index.htm