Note:
First move game folder to "C:" , "D:" or any folder then create a shortcut of WatchDogs2.exe
Right-click on shortcut - Properties, then in target; end of the line add: "-eac_launcher"
Exm. like this: "D:\Watch_Dogs 2\bin\WatchDogs2.exe" -eac_launcher
If you've run the game before, restart PC.