Troubleshooting VBA tools addin fails to load in Excel 2010 or later

Microsoft released an update in July 2016 to block Office files and add-ins
downloaded from the internet from loading automatically.  Thyus, you may not be able
to view the ribbon user interface of the .xlam file, after opening it.

Solution:
[1] To unblock the add-in, right-click on its filename and click Properties
[2] Mark the Unblock checkbox near the bottom of the form and click OK
[3] Open the .xlam addin