Hi Villian,
The Visio 2010 WBS modeler add-in still works for Visio 2013 Pro. After you have installed that add-in, you can find that template under the Categories->Addins folder->WBS Addin.
Please do let us know if you face specific issues in using this add-in in Visio 2013.
Thanks & Regards,
Sanjay Bhat
Thank you for the suggestion, however when I attempt to install the Visio 2010 WBS modeler (64 bit version as I am using Visio 2013 64 bit) I get a dialogue box that states:
Setup cannot continue because Visio Add-In for WBS Modeler requires that Visio 2010 Professional or greater be installed. Please install Visio and run setup again.
Any thoughts?