The app will load in the TOOLS tab under New Electronics Design and New Electronics Library.

Search by keyword or part number to find CAD models for over 16 million parts. Download the models directly into your Autodesk library and place them into your design. Reference Designs are available from participating manufacturers to speed up your design with known circuitry. 

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 "UltraLibrarianSymDownloader_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 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.