Halion Sonic SE Common Presets Content missing from Sequel 3 Library

I am a long time user of Sequel 3 and went to upload and revisit a track I recorded 5 years ago. The track incorporated a number of Halion Sonic SE pre-sets; which have now all disappeared from my content library. I have not changed machine, content location, etc. Where have they gone??

Do I need a new version of software (instead of Sequel 3)? If so what product will allow me to still load my old sequel projects and have access to all the content libraries I have licenses for?

Thanks,

Simon