How to plug Halion Sonic 7 in Sequel 3

Hello everyone! I’ve been re-downloading Sequel 3 to start producing some lo-fi beats, and fell in love with the free lo-fi piano instrument they added to HALion Sonic 7. However I can seem to use only the standalone version instead of having it in the list of VST instruments.
Any ideas on how to do that?

Alternatively, how do I set the standalone so that it actually send the input to Sequel 3 when I’m recording?