Nintex User Defined Actions/Multiple Workflow Help

What Changed UDA Workflow
http://www.vadimtabakman.com/nintex-workflow-what-changed-uda.aspx
Prevent Multiple workflow instances from running on conditional start
https://community.nintex.com/message/11555#11555
User Defined Actions Workflow
https://community.nintex.com/docs/DOC-1188