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I have loaded the add-on in Blender, but when I open Godot Game Tools, there is no option for Mixamo Utilities.

Hi, please make sure you are in Object Mode in Blender and also uninstall any previous versions you have, close and open Blender before installing GGT v2

I have installed add on as described, but still no Mixamo Utilities showing as you can see from attached screen shot.

Ah okay, it's because you have the newer version, the menu Mixamo  Utilities was renamed to Character Utilities