Follow the steps below to use the add-ins.

(1) You draw multiple circles on the sketch so that the pitch circles are adjacent to each other.

(2) You execute the add-in "Multi spur gear".

(3) You select multiple pitch circles in an order that takes into account the meshing relationship.

(4) You set various parameters of the spur gear.

(5) You execute the add-in "Multi spur gear".

Explanatory note

・The consideration of the meshing relationship of the later selected pitch circle is taken into account when the center-to-center distance meshes with the previously selected pitch circle.

・Multiple pitch circles with independent meshing relationships can be selected together.

・Depending on the sketch plane, the meshing relationship may not be handled properly. Please be aware of this.

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 10/11), just as you would uninstall any other application from your system.

Depending on the sketch plane, the meshing relationship may not be handled properly. Please be aware of this.