Microsoft Toolkit Collection Pack is just a pure collection package for all kinds of activators (33 ones have been collected) of Microsoft products (primarily Windows and Office) available on the Internet. Most of them are widely used and shared all over the world.
The official, original Office 2016 setup forces users to install all components, unlike Office 2013 and lower versions that allow to customize installation options. After all, most of us only need 3 most commonly used components of Office: Word, Excel and PowerPoint. That is where Office 2013-2016 C2R Install comes in.