Go to : C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher\savegames\xxxx-xxxxx-xxxxx-xxxxx-xxxxx
I found my old saves in the "262" folder. Move them into the "78" folder and it should do the trick. And disable the Uplay Save Cloud in the UPlay settings, we never know. FYI, I bought the game on Steam.