This article outlines some updated steps to running progeCAD without buying a Windows license (although some free libraries will be needed). Understand that progeCAD is at this time not officially supported on Linux, either using Parallels or WINE emulation layer More here
We were able to accomplish several things following these steps: install progeCAD, activate progeCAD (online method), load a file, etc. Our test involved using a stand-alone license key (although NLM client might also work). progeCAD runs stable but slow (depending on your core(s) speed and OpenGL acceleration).