Symptoms:

In PDF Fusion, clicking Help > Check for updates shows this dialog box which reads,

"Error - Unable to connect to the Internet. Please check your proxy settings or try again later."

Cause

This is a known issue with PDF Fusion.

Resolution

In PDF Fusion, Click Help > About PDF Fusion to check your build number.

Check this web page for updates:

https://www.wordperfect.com/en/support/updates/#pdf-fusion