I'm getting the same problem. Sent email to Xara support. They suggested uninstall the program, delete the Xara directory from C:\Program Data. Which I did. I also deleted all reverence to Xara and Magix from the registry. Re-booted the computer, re-installed Xara Web designer from the link that was sent to me in the email. I was then asked to open the program as administrator which I did. The program then did an update to the latest patch. I then re-started the program and low and behold I get a message asking me to renew my update service, so nothing has changed.
Just a thought though I recently updated to the latest version of Windows 10 Pro 1909 build 18363.592. Could this have anything to do with this?