If you’re trying Patch 1.2 because the game runs poorly, be aware:
Ubisoft never released official standalone patch installers for Unity on PC. Any website claiming to offer “Patch 1.2.exe” is (malware risk). Avoid downloading patches from third-party gaming sites unless you are a digital archivist with proper security tools. Assassin--39-s Creed Unity Patch 1.2 Pc Download