Rextus, when you first posted "error message displayed saying that the d3dx9_42.dll is missing", did you have Win 10 at that time?
You would think Win 10 would be up to date on Directx, since it Directx12. If Sneak Peek still asking for the file, could Google d3dx9_42.dll , download it and put file in your Sneak Peek folder and see if that will work.
I have not done the upgrade to Win 10 yet. Still using Win 7 64bit.