Download and install the Hololight Stream for Unreal Engine

Download Hololight Stream SDK for Unreal Engine.

Open File Explorer in Windows.

Go to the downloaded ZIP file. Right-click it and select Extract All.

Open the extracted folder.

Copy the folder named HololightStream.

Go to your Unreal Projects Folder. This is usually at "C:\Users\Documents". This is the folder that has the project file, which has the extension, ".uproject".

Double-click your project folder.

Create a folder named "Plugins", if there isn’t one already.

Open the newly created folder, "Plugins".

Paste the HololightStream folder you copied earlier in the "Plugins" folder.