We have successfully created a C# WinForms .NET 5.0 application that uses the latest version of Nevron Diagram for .NET (2019.1). The sample project is attached to this message.
Please note that version 10.6.23.12 is 11 years old and we do not plan to test its compatibility with new technologies like .NET 5.0. We recommend that you update to the latest version of Nevron Diagram for .NET if you plan to use it with new technologies and frameworks.
If you are starting a new project, you can also take a look at our latest diagramming component - NOV Diagram
. It includes a lot of new features and improvements, as well us much better Visio files compatibility compared to our older diagramming component Nevron Diagram for .NET.
Nevron Support Team