https://flyawaysimulation.com/downloads ... tus-pc-12/
Sometimes these downloads would add an extra folder that will cause the FSX Airplanes folder not to read the file correctly. To avoid this verify that there is only one folder with the aircraft name on it. Once you open the folder, it should directly display, the model , panel , CFG etc.... If you have to open two folders to get to this information, FSX will not read the file . Hope this explains it for you.
Once you download the file, rather than putting it in the FSX Airplanes folder.. Extract it to your desktop. Three folders will appear They are :
Go to Fly Away link file.
Delete all but the PC-12X folder
Open the PC-12X folder and another folder appears : AFGPC12X . This is the folder you will want to copy to your FSX / simobjects / Airplanes folder. Right click on the AFGPC12X folder and select copy, then paste that folder in the airplanes folder in FSX... Should work fine !