The app can be found under Solid>> Create>> Clean vertical Hole

[Clean vertical hole]

1: Select the bottom face.

2: Select at least one 3D circle, sketch point, or sketch circle that indicates the center to be processed.

3: Set various parameters.

4: Execute the operation.

[Circle mid air hole]

1: Select the body.

2: Select at least one 3D circle, sketch point, or sketch circle that indicates the center to be processed.

3: Set various parameters.

4: Execute the operation.

[Hexagon mid air hole]

1: Select the body.

2: Select at least one 3D circle, sketch point, or sketch circle that indicates the center to be processed.

3: Set various parameters.

4: Execute the operation.

Install:
The installer that ran when you downloaded this app/plug-in from Autodesk App Store will start installing the app/plug-in. Or, simply double-click the downloaded installer to install the app/plugin.

Uninstall:
You can unload the add-in without uninstalling it by clicking the "Stop" button when the add-in is selected in the list box on the "Add-Ins" tab of the "Scripts and Add-Ins" dialog.
Unchecking "Run on Startup" causes the add-in not to be loaded in future sessions of Fusion 360.

To uninstall this plug-in, exit the Autodesk product if you are currently running it, simply rerun the installer, and select the "Uninstall" button.
Or, you can uninstall it from 'Control Panel/Programs and Features' (Windows 8.1/10/11), just as you would uninstall any other application from your system.