Import GTFO asset files into Unity
Unity version 2019.4.21f1 is required to create a project for GTFO
Open Unity Hub and in the Projects tab click the drop-down button next to Open
Select Add project from disk and navigate to your exported assets folder
Choose the "ExportedProject" folder and ensure the editor version is correct
Open the project in Unity Hub and wait for Half-Life 3
Enjoy the numerous errors