You can add an Add-in node () from the context menu or the Home toolbar as an alternative to adding it via the Add-in Libraries (in the Model Builder). You can then import and test different versions of an add-in without adding some add-ins that are work in progress to the Add-in Libraries. Add-ins that you import from the Add-in Libraries and add to the Model Builder tree also appear as Add-in nodes. From this node, you can find information about the add-in and also reload it if needed. If the add-in contains any form, method, template, or ribbon tab definitions, Form Definition, Method Definition, Template Definition, and Ribbon Tab Definition subnodes appear under the Add-in node.

Click the Reload button to update the add-in by reloading it. Click the Browse button to browse for an add-in to import in the Import Library window that opens.

Under Add-in imported into application you find information about the filename, date, description, and identifier for the imported add-in, when available.