Designer 2013: Windows Workflow Foundation !!install!! Download Sharepoint
(WF) is the underlying framework that powers automation in SharePoint, but downloading and configuring it for SharePoint Designer 2013 often confuses users because the engine is no longer "built-in" as it was in previous versions.
If you are trying to enable the "SharePoint 2013 Workflow" platform type in Designer, you don't actually download a standalone "Windows Workflow Foundation" package; instead, you must install and configure . Essential Downloads for SharePoint 2013 Workflows (WF) is the underlying framework that powers automation
To build and run 2013-style workflows, you need three primary components: SharePoint 2010/2013 Workflow Engine - Knowledgebase (WF) is the underlying framework that powers automation