Ultimate Family Tree appears to be an application archived on the Archive website. It means that the official domain has been discontinued, but Archive kept a copy for different reasons as it's doing with practically all the websites in the world.
That's the main reason why the software can't be installed on Windows 10. It's because of compatibility. Applications from 90' are not compatible with Windows 10.
The only thing you can do is to run the application in Compatibility mode. Right click the executable/installer and choose Properties > Compatibility. Select a previous version from the list and then run the software.