We tried to contact Kunos to know if we can spread around the information, since we knew that was a private software for Marangoni (and I was surprised of a public release not announced anywhere else), but we haven't received any answer (or at least not that I know).
Anyway...I'm glad that now someone wrote about it, so I can now write something as well!
This software is not compatible with the 1.1 nor the 1.0.3 (just like the Singtel Sim).
I tried to import the track on the 1.0.3 or 1.1, but it doesn't work. I think because it's not implemented the possibility to have a circuit with a start in a different place from the end!
Somehow you can manage to have the osella on the normal tracks on Singtel (so only off line), but I will not write anything else about it since it's maybe not allowed by the EULA.
Anyway let's wait for the official release of this car/track, whenever is gonna be and let's take this just as a preview.
The car, if you disable traction control and abs is pretty nice to drive and the circuit is awesome. Arriving to the end with your car still in one peace it's a real challange!