Nucleus Workstation on Launcher will be deprecated on October 1, 2025. Nucleus will now be available on the NGC Catalog (Linux only) and can be accessed with an NVIDIA Developer Program (for testing and development only) or an Enterprise account (for production use and enterprise support).
Find the installation instructions here: Enterprise Nucleus Server Installation — Omniverse Nucleus
If you have any questions, please feel free to reach out on the NVIDIA Omniverse Forum: Nucleus - NVIDIA Developer Forums.