Do not use BitTorrent for this (VPN or not—it’s risky). Use legitimate download functions:
: Full seasons and individual episodes are available for purchase on Amazon Video and the iTunes Store. The Evolution of Ooo -WORK- Full Adventure Time Episodes
(Cut to: Finn, back at Tree Fort, doing dishes. But he hums a happy tune. A tiny compost sprout grows from his pocket. End.) Do not use BitTorrent for this (VPN or not—it’s risky)