Unlike its successors, this entry remained an Xbox One exclusive, meaning any "PC torrent" or "full version for Windows" found on sites like The Pirate Bay (TPB) is likely a scam, a virus, or a fake file.
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Why no PC Port? - Off-Topic - Official Forza Community Forums 2 Jan 2015 — The Ultimate Guide to Forza Motorsport 5 PC
That being said, some popular torrent sites include: some popular torrent sites include: