For most players, the best "download" is simply letting your game client verify files: Ubisoft Connect Properties Verify Integrity of Game Files
If you own a legitimate copy of the game, downloading Patch 1.2 is entirely automated. You do not need to hunt for standalone installers on third-party websites. For Ubisoft Connect (Formerly Uplay) Launch the desktop application. Navigate to your Games library. Select Assassin's Creed Unity .
Patch 1.2 focused primarily on game stability, graphical fixes, and control responsiveness. It targeted the immediate, widespread issues reported by players during the launch week. 1. Crash Fixes and Stability
Do not download random "Patch 12 fix packs" from third-party forums that claim to boost FPS beyond 1.5.0. These often contain malware or break the game’s anti-tamper. The official v1.5.0 is the only stable version you need.
Patch 1.2 (often rolled into later cumulative updates for modern installs) was a massive technical overhaul. It wasn't just a few bug fixes; it re-wrote how the game engine handled resources.
For players installing the game via original physical retail PC discs, the game will install the base 1.1.0 version. Install the game completely from the discs.