Create a folder in a preferred place (for example C:\sources) for the Unreal source and navigatethere.
Clone the Varjo Unreal Engine GitHub repository.
Note: Access to the Varjo Unreal Engine repository is granted to developers who already have access to the Unreal Engine mainline GitHub repository. Developers who would like to sign up for the Unreal Engine repository via GitHub can follow the instructions onthe official page.
Run /UnrealEngine-/Setup.bat to download all the dependencies. This may take a while as there is around 5 GB to be downloaded.
Agree with the prompt about project type if it pops up.