In computing, an add-in (also called plug-in, add-on or extension) is a software component that adds specific commands and features to a software - in the example case Microsoft Excel®, but Microsoft PowerPoint® works alike.
Planning Helpers are VBA add-ins and come in the regular add-in file formats: .xlam (Excel) and .ppam (PowerPoint). For the set-up you do not need admin rights.
The steps below apply to the installation of any add-in for Microsoft Office®.