There's a separate repo for pd-l2ork 1.0-- that's the one that uses tcl/tk/tkpath for the GUI.  That codebase has been officially merged with pd-l2ork 2.0 (which is what I call "Purr Data").  Official in the sense that we've gone through and tried to make sure that we ported all changes to pd-l2ork 1.0 during the time pd-l2ork 2.0 was being created.