Keep Circulating the Tapes: No official release or broadcast of the pilot has ever occurred. Officially released excerpts from the pilot on YouTube and a leaked screener making the rounds are the only ways to experience it.
As the pilot for a series that never got made, it's anyone's guess as to how an actual series would have progressed. Pilots often include elements and characterization that are changed for the actual series, and in fact, the pilot itself could have undergone changes before it was broadcast (it would have been easy to remove the security guard murder, for example). Many elements that attracted criticism may well have no longer existed had a series been commissioned.
Alternately, considering that only a year later, Arrow became a success despite featuring a similarly murderous vigilante hero who, over time, toned down his illegal actions and became more sympathetic, Wonder Woman may have gone a similar route. However, the major difference between the two is the fact that in Arrow, everyone rightfully called him out on his murderous actions, where in this, everyone completely loves her for doing the same thing.