Download the widget and double click on the .mulib file it.
It should show up in "library" panel.
I am feeling that you are trying to find it in "widget library" panel.
Thank you for reply
I think it's ok but when i install i don't see Muse in the window, only photoshop, indesign ans Illustrator, maybe the problem is there... You can see on the photo
a nice widget design... willing to bet Chris had a hand in that one