If you are looking for an official "Patch 12" to download, you will not find one. Ubisoft never released a twelfth major patch for the game. The Official Patch History
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The original version of Assassin's Creed Unity is available on Ubisoft Store, Steam, and Epic Games Store. Subscribers to Ubisoft+ Classics and Premium can also access the game through their subscription. If you are looking for an official "Patch