Be sure to have Unity 2019.2.0fl or newer in order to use this app. To the right there is link to download Unity3D.
In order to run the application a user first has to download the application from GitHub, to do so either click on the button to the right or return to the Project 3 main page (button at the bottom).
After that make a clone of the Project 3 repository, then remove the Assets/VRTK directory and reinstall it from Git according to the VRTK 4 instructions located under 'Cloning the repo'. After that start up the appropriate version of Unity from Unity Hub. From there you should have no error when trying to the project.
Once the GitHub web page is opened:
Once the app is saved:
Once the app is opened:
Once the Garden scene is opened:
Doing this allows you to use the VIVE devices
To use the mouse while the game is running press "esc" key on keyboard