The demo version of the St. Omer sample set can be downloaded directly from the web page of the virtual organ. It is necessary to download all 3 available packages and install all of them into Hauptwerk.
The limitation of the demo version is the limited number of sounding stops available:
Positif: all 13 stops available.
G.O.: 3 stops available (Bourdon 8, Montre 8, Prestant 4)
Récit: 3 stops available (Flute harm. 8, Viola di Gamba 8, Trompette 8)