Be sure to start TomTom Home and select the menu BEFORE the navigation system is connected to the USB, otherwise the menus will be grayed out

And secondly:
How is one supposed to find that "Add voice" is displayed on the first page of TTH and you have to scroll to page 3 to find "Add computer voice" there.

Be sure to note the first point, then you don't have to laboriously and slowly download the files.

---

Adding the "computer voice" via TTH, inside folder 'voices' I got the missing configuration file, finally. Now, when I click on test on the GO930 it does say its preview sentence