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So if you have a 64 bit version of office then MindManager should install the 64 bit version. If you have a 32 bit version of Office on a 64 bit OS you should install the 32 bit version of MindManager. If you have a 64 bit OS and are not using Office then you should install the 32 bit version of MindManager.
Mindjet Mindmanager 2018 Learn The Basics in 12 minutes.