I don't know WorkFlowActivityBase entity, but if you work with C# like it seems you do you could download the "proxy" class from your solution. It's probably an entity in your solution, that's why you can't find it in any nugets. We use XrmToolkit , but there are tools from Microsoft as well. With XrmToolkit (or any tool), you will be able to connect and download "class" files of your entities, and its there i guess WorkFlowActivityBase comes from.
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