There’s 2 ways of doing it that i know of: if you still have version 9 on your computer open the project. then go to file< save as and click on what shown in pic below a drop down menu will appear with all the different versions. or you can just open the file and it will be automatically opened by the newest version of envisioneer that you have the convert a copy will automatically pop up )that pic is also shown below), that should work unless the older versions were different then now.