Code for Airplanes (and cars and other safety critical applications) follows a special set of rules in order to eliminate wonkiness that tends to crop up in complied programs (usually the result of undefined behavior, not always the programmers direct fault).
I've used it an age ago. Don't bother. The software wasn't terribly sophisticated. The library support was OK at best. And the only thing it really does is make ordering a little easier. It's only slightly more work to use a FOSS tool and generate output which can go to and board house.
As a professional electronics design engineer, this is potentially a hugely valuable service. A big chunk of time is, as @jwr states, spent creating CAD representations of real parts. Other professional library services exist, but they are very expensive. Well done.
It's fine that the OP doesn't want to pay for media. But, the OP should not take it, no matter how easy it is to do. By all means, abstain from media. But do not steal.
Just a suggestion. You could try installing something called "netbalancer" by seriousbit (http://seriousbit.com/netbalancer/ assuming you're on windows). It allows you to throttle network usage per program.