We recently upgraded to Office 2016 which included Project Pro. So far we haven’t seen any problem except one to which I am looking for answers. Our projects are maintained on Project Server 2013 and there are no issues to edit them with Project Pro 2016. Have to admit that we use the vanilla version without any add-ins. The only issue we have is when it comes time to manage calendars. As soon as you try to edit a calendar, Project Server 2013 request the Project Pro 2013 be available. Didn’t find yet how to circumvent this issue.