The window opened after checking for an update under the help menu
see image:

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I installed it by following the indicated steps from the program, I got a message saying that the update was successfully installed. I then fired up Xara again to check if it applied the update, but nope, nothing happened and still running version 18.5.0.63630.

I will try rebooting the computer later, and see what happens. I know that shouldn't be the problem, but then again different companies doing different things with their programs.