You can register your MachXO3D Security License Serial Number here:
https://www.latticesemi.com/Support/Licensing/DiamondAndiCEcube2SoftwareLicensing/MachXO3DDiamondSub.
If you have received your Security license, you can concatenate it with you existing license or edit the environment variables to include the path of the Security License.
If you encounter any issues, please raise a Techsupport case at
http://www.latticesemi.com/Support/SubmitSupportTicket.