DSOGaming writes: “Assassins Creed Odyssey has been officially released, however it appears that this latest open-world game from Ubisoft will not work on CPUs that do not support AVX. This basically means that the game will not launch at all if you are using an older Intel or AMD CPU that does not support it.”
Source: N4G PC Assassin's Creed Odyssey will not work on CPUs that do not support AVX