The Trial Versions of the Klais stereo-mix extended Demo Organ has a limited compass of C2-C3 (048-c to 060-c) in the pedal, C2-G5 (048-c to 079-g) in the manuals. All other functions work.
Free download the Klais stereo-mix extended HW demo sampleset! (1.59 GB)
I suggest you buy only after trying the demo.
Klais Organ of Szikszo stereo-mix original version.
(It contains only the stereo mix original version without extended copulas and without Solo division)
The price is € 89.
Klais Organ of Szikszo premium version.
(It contains the stereo mix original and extended version and dry version, and wet version and surround version.
The price is € 129.
Upgrade from stereo-mix original version to premium version
The price is € 40.