I need to to save a project I have drawn in Inventor 2015 but be able to open it in inventor 2013 is this possible.

I don't believe one can back save in Inventor as one can in AutoCAD.There is a way you could open the file in 2013 BUT you would lose not only the feature history but all of your constraints as well.  Export as a STEP file from 2015 then import as a STEP file in 2013.  This works only for iam and ipt files.

John Connor2016-03-08 15:16:04

Thanks John I'll give that a try