A user previously had ProjectPro 2013 subscription installed on her PC a while back. FastForward, we just reimaged their machine. Installed Office 2013 E3 license then went to install her ProjectPro subscription again and received the error: "Some older apps don't work with Office 2016. Before installing the new office, we need to remove: Microsoft Office 365 ProPlus - en-us" Which obviously we need. It appears that O365 is just installing the latest version of Project, without the option to install 2013. Is the way it's supposed to work? Is there a way around this?