I’m looking at my Halion 3 library and see I have about 11G of sounds and IRs stored on my PC (used also with C10, a combined folder). I have downloaded the new Halion Sonic SE version and see there is 29G of downloadable sounds available. What? 
Are these for the Halion 6 product only?
When I performed the update, BTW, I believe the Halion update program said (as it finished) that I didn’t need to update my sound library.