There is an option to install either the 32 bit or 64 bit version of Office 365.  Microsoft changed the default version to 64 bit last year because the majority of people are using 64 bit operating systems.  MS Office installations, and associated products such as MS Project or MS Visio need to be either 32 bit or 64 bit.  The two versions cannot be mixed on the same device.  I have no idea why Intuit would not match the default Microsoft platform to make thing easier for non-computer people...