Downloaded whole U-Play thingy, dug up my log in and password and accessed my account. Last week I too felt the nostalgia and decided to re-install Anno 2070. Meanwhile U-Play arrived and finally took current form. Finished the game and didn't came back since then.
Later I got Deep Ocean DLC which was added to my game. I got my Anno 2070 long before U-Play launcher was introduced.
I may have a solution as I faced this problem few days ago.
