Got it working, I had only installed WiX v3.11.1, so I also needed to install WiX v3.11.1.
Now your code shows the setup screen correctly. I shall give it a go.
Thanks, Nikolay.
P.S. There is a small mistake in your text.
"Adds project for the add-in. Nte taht ..."
I suspect you mean "Note that ..."
Also, in the Add-in project options, in the bit about Visio 2013 interop assemblies, the text cuts off after "... assemblies (Visio 2013) will be".
HTH