I am experiencing this problem when starting Cubase 12 Pro, I have searched for the licences that is asks for , and I can’t find them anywhere.
Hi and welcome to the forum,
Only HALion Sonic SE is part of Cubase license. HALion Sonic is own product.
Start Steinberg Library Manager and delete all HALion Sonic (HS) libraries. Keep just HALion Sonic SE (HSSE), please.