Nemeth Designs Mi-24A Installer issue

Hello, I have purchased the Nemeth Designs MI-24A from the Nemeth Designs website and I am now having troubles with the installation, I have put my serial no. that was given to me. The installer installs but I won’t install the model files due to an “Error 11FD”. Help would be appreciated

platform: FSX SE

I will attach 2 photos (installer issue and proof of purchase)