This plugin relies on Unreal Engine 4.26. If you don’t have this, you can download it using the Epic Games Launcher which is available here.
First, open Unreal Engine and select the “New Project” tab
Next, select a template from the list. Name your project, choose a file location, and press the “Create Project Button” in the bottom right.
Next, navigate to the folder where you saved your new UE4 project. Right click and create a new folder named “Plugins”.
Navigate into the “Plugins” folder and paste the HoloPlay folder into the folder. If you don't have a Plugins folder you can make a new folder in file explorer. Once you've placed the HoloPlay Plugin in the proper folder you'll need to restart your project for Unreal to load it properly.