

It is important that there remains no left-over files from the previous Uplay installation.

Even if you could execute step 1, manually delete the Uplay (or Ubisoft Game Launcher) directory located C: \ Program Files \ Ubisoft \ Uplay ( or Ubisoft Game Launcher) for 32-bit Windows, or C: \ Program Files (x86) \ Ubisoft \ Uplay (or Ubisoft Game Launcher) for 64-bit Windows - unless step 1 has already removed it.

Uninstall Uplay from your Windows uninstall-program list. The Forum Manager there (a Ubisoft employee) recommends to totally remove and then re-install Uplay, according to this procedure : On the French Ubisoft forum dedicated to 'Heroes VI' there are a few recent topics pointing to the recent Uplay update as a cause of problems, for some users.
