Geoid 18

Hello,
Working my way into Carlson2020 with IntelliCAD. Geoid 12B is loaded and I want to add Geoid 18. I tried searching and now resort to asking.
Thank you.
Working my way into Carlson2020 with IntelliCAD. Geoid 12B is loaded and I want to add Geoid 18. I tried searching and now resort to asking.
Thank you.