I'm surprised that radare[1][2] hasn't been already mentioned. It can support basically any architecture you can think of, runs on all major OSes, and has bindings for a ton of popular languages.
I think Binary Ninja may support Windows but would need to double check
There's torrent... If it's for personal use, there are many countries where it is not illegal to torrent software. Yours might be one of them.
Torrenting involves uploading data, which is considered distributing content you don't own. So I think torrenting copyrighted content is illegal most places. A regular http download might be legal though more places.