Attention! NO KEY IS REQUIRED to run the free version. If the program does not start, then the reason is not in the key, but in compatibility with your system. For fixing this you can try:
- Run the simulator with administrator rights.
- Install the latest drivers from the graphics card manufacturer’s website.
- In the settings window, enable the “Compatibility Mode” option in the “Graphics” tab.
The new version can be installed on the previous version.