Halion Sonic SE Triebwerk

My fellow collaborator sends me songs in Cubase which is wonderful. Usually no issues but I didn’t have Triebwek installed. Now I’ve added it twice; says it’s registered in Library Manager but does not appear in Halion Sonic SE. I own Halion 6 and RAST and a few other soundsets - I see Triebwek is $74 dollars - but if I own it; should it appear as a separate licence in the Steinberg Licence Application? Thanks very much.