Win 10 Enterprise 2019 LTSC Global KEY
If you still don't know how to activate it, please find it HERE.
Win 10 Enterprise LTSC 2019 builds on Win 10 Pro, version 1809 (updated Sept ’18) adding premium features designed to address the needs of large and mid-size organizations (including large academic institutions), such as advanced protection against modern security threats, full flexibility of OS deployment, updating and support options; as well as comprehensive device and app management and control capabilities.