Confirm that you are using a 1.8.0 version (Heroes VI: Standard, Deluxe & Gold editions) or 2.0.0 (Complete Edition, Shades of Darkness standalone) in the lower right corner of the main menu, and then exit the game. Click on the Heroes of Might & Magic VI shortcut (this may look like a Shades of Darkness icon or a Heroes VI standard one, but it is the same game), to launch the game. Launch Uplay and open the My Games section.
In order to fix this issue, we strongly recommend that you follow the steps below: How to update your game (all versions) to the 2.1.0 version: Uplay version. We are aware that some users are experiencing difficulties with the auto patching system.