In order to register an instance of RavenDB with a license you can either:
Rename the license file to License.xml and put it in the bin folder where RavenDB executable exists
Or use the following configuration options:
Raven/License The full license string for RavenDB. If Raven/License is specified, it overrides the Raven/LicensePath configuration.
Raven/LicensePath The path to the license file for RavenDB.
Each instance of RavenDB outside of the development machines must be registered with a license.