I would assume that if there is a problem with the Turboprop Simulations - Lockheed C-130 Hercules Sound Pack, that it is not a Captain Sim problem. I'm saying this because the sounds are installed into the sound folder and are controlled by the sound.cfg found in that folder. Seeing as that is not the Captain Sim sound.cfg, the problem might be there.

Anyway, I reinstalled the Turboprop Simulations - Lockheed C-130 Hercules Sound Pack, and it's working fine in my CS C-130. It doesn't seem to be doing in mine, the same as it is in yours.  :(

I renamed the sound folder in the FSX\SimObjects\Airplanes\CS_C130 folder before installing the Sound Pack. Not that I really think it would make a difference because the sound.cfg from the Sound Pack would overwrite the Captain Sim one. At least I assume it would. :-/