Now that we have a basic understanding of prefabs out of the way, we will need to install the HoloToolkit (HTK) in our project in order to get into user input. The HTK is a collection of useful tools and examples of how to implement them. Many of the tools that have been designed for the HoloLens are in this very useful repository. The group contributing to the HTK are very active and major changes happen weekly; it is highly recommended that you keep up with the ongoing changes:

1. First, you will need to find the HoloToolkit ZIP file that you downloaded (or download it now from h t t p s ://g i t h u b . c o m /M i c r o s o f t /H o l o T o o l k i t - U n i t y ) and extract it to your desktop or to a temporary directory.
2. Open the directory that you extracted the files to and double-click on the Assets folder.
3. Select all the files in that directory either with your mouse or using Ctrl + A.
4. Split the screen between your Unity window and your extraction directory:

Screen split between Unity window and directory

5. Click on the selected files and drag them down to the Assets folder in the Unity Project view:

6. This process can take some time to complete, so be patient. On completion, your Assets folder should have these new additions:

7. We are nearly ready to begin the next section of our project. However, first select the Platform object from the Hierarchy view and press the Delete key.
8. Now, press Ctrl + S to save the scene.