MSPhysics is installed but does not appear on the interface? (Fig 1)

Extensions
#1

SketchUp%202019
SketchUp%2020191522×964 325 KB

#2

And the answer from the author: MS Physics and SU 2019 • sketchUcation • 1
2019-05-17_194719

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#3

but in SketchUp 2018 it work…I used it some time