We are currently using Nevron Diagram version 10.6.23.12 with VS 2005. (Don't laugh.)

We are upgrading to VS 2013 and would like to upgrade to:
Nevron Vision for .NET 2014.1 for VS2013 .NET 4.5 (build version: 14.6.27.12)

However we are concerned about the .Net 4.5.  Does that mean it supports "up-to" 4.5 or that it "requires" 4.5?
We still need to support clients on who are on XP, so we can't require higher than .Net 4.0.

Would software written with Nevron Vision for .NET 2014.1 for VS2013 .NET work with .Net 4.0 or even 2.0?

Thanks in advance,
Jason