There is no information about the software on the websites listed as the official one. I've use the search function to look for Edigraph but nothing came up on the results lists.
However, since compatibility is uncertain, if you have the setup package, right click it and choose Properties > Compatibility. Select a previous version of Windows from the list and then tick the Run as Administrator option. This appears to be the only way to test the application for Windows 7 compatibility.