When you see the message License/Proxy server needs upgrade to the latest version, it means that your license server on another computer is not updated to the same version as the application you are trying to run.

In this example, the user is trying to load V6.8.1 Layout application whilst the PrintFactory license server (on another computer where PrintFactory is installed) is using V6.7.1

To solve the situation, you need to ensure all computers with PrintFactory installed are using the same version.