halftone image creator add-in impossible to install

[jvh674QU83]

i have bought the halftone image creator from kev ramsay in the fusion 360 app store

after running the install script, the add-in arrives in 'user > library > application support > autodesk > autodesk fusion 360 > api > addins > HalftoneImageCreator.bundle

the add-in is not visible though in tools > add-ins

and when i try to add it with '+' the HalftoneImageCreator.bundle is not selectable

i have had contact with kev who was really helpful but we could not work out what goes wrong

he sent me by email the latest macos package

i m having a student license

with latest fusion 360 version 2.0.7463

on macos 10.15.3

any idea what may go wrong ?

[jvh674QU83]

in case some one has the same issue - i have been able to solve after hours of searching and testing

i fact the plugin is automatically installed at this location /Users/<username>/Library/Application Support/Autodesk/Autodesk Fusion 360/API/AddIns/…

but it only works from this one /Users/<username>/Library/Application Support/Autodesk/ApplicationPlugins