Hi zxmb4502,
I am Dave, an Independent Advisor, I will help you with this.
Using utilities like UltraUXThemePatcher in Windows 10 is a really bad idea, every day on Community we have people who have a corrupted operating system by using a theming utility and other people who tried to remove the theming utility and could not get back to normal Windows 10 because part of the UI was not rendering correctly.
It is up to you in the long run, but Microsoft strongly advise you do not try to theme Windows 10, that utility you named is safe, it is not any sort of malware, but it does change many of the DLL's in Windows 10 and a lot of Registry entries, that cannot be undone without a full clean install of Windows 10.