You do not have to create any aircraft file in the AFPD directory as the download is an executable file. If you have, please delete it completely or it will not install correctly. Just run the .exe file as I mentioned above and it will install everything automatically.

Then, go to the tmd file in the aircraft folder:

// file: katanak.tmd
// version: 1.9.0 -> change this to 1.8.0 and click save

Your version of AFPD is displayed on the top right corner of the main menu. Please check it and let me know