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The Rubicon has been crossed. Complete Edition is installed despite the presence of older versions, and all achievements are intact.
First of all, the installer does complain about the presence of older versions and their incompatibility. And this is regardless of where they were installed. We agree to delete them, install Complete, and when asked "Delete all settings and user profiles?", we answer "No way!", and that's it, the game is installed. We launch it, update UPlay, unlock the Complete Edition in the game menu, and enjoy it :-)
And Ubisoft's support needs to undergo a thorough review for their poor English and cruel misinformation (>_<).