It is required to extract the exported zip file in order to access your labfolder data. When opening the extracted folder you will see three folders named projects, static and templates, and two html files named projects and templates.
Open the folder projects, and you will see folders that organize each group project.
In each group project folder or subfolder inside it, you will see html file named index. Open the index.html to view your ELN offline.
Once the index.html file is open, you can view your ELN offline directly from your local drive.