Hi droosta, there is an error in the default destination folder during installation. When you run the exe file, just change the destination folder to what you see in the attachment here or just copy this and paste it into the window C:\Program Files\IPACS\AeroFly Professional Deluxe

The German authors used C:\Programme\IPACS\AeroFly Professional Deluxe as the destination folder. I think "Programme" must be the German Windows version of "Program Files". If you find any folder named "Programme" in your c:\ directory, just delete it.