If this is resolved, could you post the resolution here so others can benefit?
possible to run .NET code as an excecutable which is referencing the visualcron dll. I did this for a long time now. You also an run an assembly task if you made your own dll.
You can not create a .NET task and reference the Visualcron dll. This is not supported.
Due to upgrading Visualcron to newer versions, you have to upgrade your .NET app also. It needs to have the latest Visualcron dll's.
I solved this by make use of Powershell and reference the dll's in the installation folder. This way I always have the latest dll's and I do not have to recompile my task anymore.
Uses Visualcron since 2006.