I'm sorry to hear that you are having so many problems with the Captain Sim C-130.
While I don't think your "system is too advanced for Capt Sim", I do not know why you are having so many issues with it. Lots of people have had problems with Captain Sim products in Windows 10, so it is not supported at this time. I'm sure that future updates will support Windows 10.
When you installed it, did you use the Instant Online Activation, or the Manual Offline Activation? If you did the Instant Online Activation, I suggest you try the Manual Offline Activation, as it often works better. Not only that, but it gives you the benefit of multiple installs on your computer being a single install (great for when having persistent problems like you are having).
While sound issues are common on the C-130, I haven't had as bad a problems as you are having with them.

If the Manual Offline Activation does not fix most of your problems, then I can only assume that something else you have installed in FSX is conflicting with it.

I'm sure you will get your refund, and I am really sorry that you didn't get the enjoyment out of it that many others have. :(