You know I just looked at the 9x, and it looks like the trainer/sim port is a 3.5mm audio cable connection (TS conector). Since you are running Windows you can just use 3.5mm mono audio cable from your radio to the mic port on your PC, and use
Smartpropoplus to convert the signal to a "game controller" signal that your simulator will recognize. That would be the cheapest, fastest, easiest way to get this all working. You may even be able to use a 3.5mm stereo cable to do the deed, and that is something you may have sitting in a box of computer cables. EDIT: the cable will have a 3.5mm connector on both ends.
As far as the missing DLL, sometimes they just don't load (at least that used to be the case). Have you successfully launched the app on your machine before? If not you could have a bad download, and a new download and installation could take care of it.
Since you are still reading I'm going to assume that you have a good installation... You may be able to kill the app, and make sure that you go to the "Task Manager" to make sure that it isn't holding onto life in the background. Once you have killed it try launching it again. If that still doesn't work you may have to restart your machine.