https://youtu.be/QWvPXeShczk?si=3MjKQO-OUTWwNihx
The project comes as a complete project but can be migrated or copied to your own project with some consideration
For the assets and the level to work correctly you are required to enable certain engine features and plugins.
Go to the folder named Tropical.
Right click on it and select migrate.
Chose the path where your project is located and wait for it to finish. It can take a long time.
If it doesn't work for you , you can just copy the files manually into your own project.
The main level would not appear in a content browser unless you enable the required plugins !