I usually don't like downloaded OS on torrent since you can buy the key for less than 5$, shoppe & lazada are offering this. But if you really badly need the free edition you can either get the trial version or download a ISO torrent.

For paid key:

1. If you want a paid key, you can go to microsoft and download the software their they had instruction.
2. Go to shoppe or lazada, search for windows 10 key, check the ratings then buy it for less than 5$. It will take a couple of hours for the seller to reply but it will be worth it and 100% legit.

Hope that helps.