Question: I have installed the CRM 2011 SDK addin for visual studio 2012 (ultimate) and am trying to create a XAML Workflow Activity

I have added the CRM Workflow items to the toolbox using these instructions [Add Microsoft Dynamics CRM Workflow Activities to the Toolbox](http://msdn.microsoft.com/en-us/library/fb513e3f-3ed8-44fe-8d4c-e1a8aef29870#add_to_toolbox)

When I try and drop a Workflow on the design surface it say in red text "Could not generate view for Workflow"

Hovering over the text reveals a System.IOException that says "Cannot locate resource workflowdesigner.xaml"

How do I fix this?

Answer: 
I fixed this by dumping the contents of my CRM SDK bin directory (about 24 assemblies) into C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE\PublicAssemblies

Not elegant but obviously there was a dependency in there somewhere.
OK, I also hit this problem and made it work with your hints, I reached this result:

1. Changing VisualStudio version had no effect.
2. Changing the SDK version actually worked!

I am using SDK for CRM 2015 with version of 7.0.0.43 with visual studio 2015 and 2017. You can download it directly or use Nuget For "Microsoft.CrmSdk.Workflow" and "Microsoft.CrmSdk.CoreAssemblies"

SDK for 2018 (8.0.0) and Dynamics 365 (8.2.0.49) did not work.