Cannot Create Custom Instruments in Halion 6

This is the weirdest thing. There are a great number of users who cannot seem to make a custom instrument that works in the free download Halion Sonic SE.

Steinberg support has been working on this with me for weeks, and they cannot create an instrument either! What in the world!
This is crazy!!!

A British guy posted a YouTube video, with no details of the Library Creator, and his custom instruments work perfectly!
Here is his link: https://youtu.be/pRoAyJ6jf8o

This was hailed as one of the BIG features in Halion 6! Bummer!

Any update on this? Just got back to playing around with Halion 6 and curious if I should even try to make this work. Can’t seem to find any custom instruments around the internet…