Captain Sim famously recorded real C-130E/H models. The distinctive whine of the propellers during beta range and the roar on takeoff are auditory hallmarks that no freeware model has ever matched.
For those looking for "exclusive" free content or a way to try before they buy, there are legitimate channels: FSX RNZAF C-130E 2014 Scheme - Fly Away Simulation captain sim c130 fsx free download exclusive
This isn't a "point and fly" aircraft. You have to manage the four Allison T56 turboprops carefully. Captain Sim famously recorded real C-130E/H models
The startup sequence is satisfyingly complex, requiring proper bleed air management. captain sim c130 fsx free download exclusive
: If you prefer a completely free aircraft, the "C-130 C3 Hercules Package" on Simviation is a well-known freeware alternative for FSX. C-130 Expansion for MS FSX - Captain Sim