Downloading copyrighted material via P2P networks can lead to DMCA notices or fines from your Internet Service Provider (ISP). Quality Control:
The third installment is famously "100% politically incorrect" and features a 500-person centipede.
The film's creators seem to have lost all sense of reason and decency, pushing the envelope to the point where it feels like they're trying to shock and disturb rather than entertain.
Instead of risking a torrent, you can find The Human Centipede 3 (Final Sequence) on various reputable platforms: