Exactly what StormILM said. And thank you Dumonceau.
The new version was mainly based around canard equipped versions of the Mirage III/5. So it may have meant that most of the first package were not going to be updated (I'd have to read old emails to see what was discussed). Just looking at the aircraft.cfg file there was a IIIS and a IIIRS with Swiss cockpits when work stopped. There was also for sure going to be a Cheetah E.
Regarding the original sold through Skysim, unless Mark has a change of heart (and I bring up the subject regularly when we email), if you don't already have a copy you are out of luck. The copyright protection scheme that was used assures that. C'est la vie.