Upgrading site license from Cubase 9 elements to 11 artist

Hi, would appreciate any guidance on this if poss please.

My school has 30 licenses of Cubase 9 elements with Halion Sonic SE3

I would like to upgrade and wondering what might be the best options.
Could I upgrade from elements 9 to artist 11 for instance and would that give me a greater amount of Halion content?

Also, who would I do it with; as in who do I swap the old licenses for the new ones with?

Any advise gratefully received.

Thanks