Symptoms
I have the same issue addressed in this forum post: http://community.k2.com/t5/K2-blackpearl/Missing-Process-Wizards-in-K2-Studio/m-p/69084_M19819. Is it possible to get the process wizard on a workstation install?
Diagnoses
This usually means that a Component hasn't been installed, it could be K2 Blackpearl client tools, K2 SmartForms Client tools or the K2 For SharePoint Services.
Resolution
installing the K2 For SharePoint 2013 Services.