Learning Lab for GHE uses the same .ghl license as your GitHub Enterprise appliance. To upload your license to Learning Lab, visit the running application and go to the /license page: <your-learning-lab>/license.
If your installation does not have the required license, you will always be directed to /license to upload your .ghl file.

To upload your license:
.ghl fileYou do not need to apply the license to GitHub Enterprise itself.