If you are looking for a uTorrent 3.6 Pro license key or an activation code, it is important to know that BitTorrent Inc. does not distribute "keys" for perpetual activation in the way older software did.
Alternatives
Recommendation:
Use the free, ad-supported version from the official source, or purchase a legitimate Pro license if you need the extra features. Avoid any site offering “keys” or “cracks” — they are almost always malicious. utorrent 36 key