I've just recently check out what the guys at Free Falcon have done to the old Falcon 4.0 and its previous Free Falcon updates. And all I can say is Wow! The guys there have done a superb job. Not only can you fly just about any aircraft in the simulator but they've even upgraded the graphics engine to be much much better than the original ten years ago. Just take a look at the video below.
For those also interested in Free Falcon. Check them out in http://www.freefalcon.com/ By the way, that variant of Falcon is all free also. You don't even need any previous version to use it, just get them in the website above. But be warned, that version is for those already familiar with Falcon 4.0 and its previous variants like the SuperPak 4.0 and the other Free Falcon versions. If you are just starting new, you will be overwhelmed by the huge manual it has. The pdf added manual is over 700+ pages.