If you're using it, and it is helping you significantly, then could you consider buying it?. That would be the "proper" thing to do. But if you can't afford it, or don't feel it would be "worth" that investment of money ... then there are other options (although not strictly "legal" in some cases).
For example torrent/p2p. I avoid it, for "security" reasons (is a fairly risky thing to use).
Or a file-downloading program (I have "GoForFiles", did a search in it, and it MIGHT have found some of dr richards files (is ~800MB), but i'd only know if i downloaded; & i'm not willing to expand a large chunk of my broadband data allowance (only on 5GB) for something i won't even use, as i get charged excess fees for every extra GB used, which isn't cheap).