Add size to Parts list, in the design workspace:

• Right-click one or multiple components and select Link Size/Description. The size in the component's description will stay updated from now on.
• Create a drawing and place a table: the component size will be shown as the component's description.

Remove link (and remove dimensions from the description):

• Right-click one or multiple components with a linked dimension; select Link Size/Description. 

Note that Assemblies cannot be linked to their size. (If necessary, get in touch with the developer!)

Install:

1. Download the installer from Autodesk App Store.

2. Right-click on the "Downloads" folder and select "Open in Finder".

3. Right-click on the "SizeToPartsList_macos.pkg" -> "Open With" -> "Installer".

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 Autodesk® Fusion 360™.

- Navigate to the ./ApplicationsPlugins folder and select the app bundle you want to uninstall

- Either drag the app bundle to the Trash or right-click and select “Move to Trash”

- Right-click on the Trash-Can and select “Empty Trash”

- If you prefer keystrokes, you can also just select the app bundle and then hit Command+Delete to move the app to Trash, then empty the Trash and the app will be removed.

Manually changing the size in the description text will prevent the add-on from recognizing it as the previous dimension; on the update, new dimensions will be added instead of replacing the old dimensions.