Start a new game on license (Assassin's Creed: Unity)

And so ,because the developers have not provided the opportunity to start a new game share this method with you.
First,we need to delete or move to another place the savegames folder(this folder located in the folder Uplay).
P. S if you have other games in Uplay save,other save other games,don't forget about it,or if you know the destination with Unity,then delete this folder and all.
Second,go offline in Uplay or turn off the stupid Internet.
Third,run the game see that there's a new game.
When you run Uplay in online,then choose save from the PC and not the cloud,and that's all.