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With allot of email's to steam and ubisoft, and getting no help what soever i started to try everything possible to let uplay play my steam version of M&M Heroes VI.
the only thing what worked for me was uninstall uplay and M&M.
Then i reinstalled M&M trough steam.
then i went to the root map of the games in steam.
its something like program files/steam/steamapps/common/mightandmagic6/support
notice the last map is the support map here you can instal the game's ubisoft game launcher.
when i did this everything started patching it even patched the game then it trows you in the uplay launcher.
then exit this and try to start the game from steam.
it asked for my cd key, i entered it and it worked.
hopefully i could help some of you guys with this
let me know if it worked
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