Installing a new license can be achieved on the command line, via the CLI, or via the GUI.
Installing a new license can be accomplished a few different ways. The simplest method is to copy the license file to each indexer and webserver at the location /opt/gravwell/etc/license. Once the license has bee copied in, restart each service using SystemD:
systemctl restart gravwell_webserver && systemctl restart gravwell_indexer
If you prefer not to restart your instance, you can use the the Gravwell command line interface (CLI) to update the license. Updating a license requires that your Gravwell user have administrative privileges. The license_update command is available under the admin command set in the CLI.