That link sends me to the 1.96 download page. In my SCP installation there is drivers.pkg in C:\Program Files (x86)\SignCut\Resources created Wednesday, May 7, 2014, 9:01:34 AM. I wonder if that is the plotter preferences. I wonder if it is, where I could find a different version of that file......
UPDATE:
I contacted SCP support. They upgraded my licences number. Now Liyu appears. I changed the settings. At this moment, it is running a job that in 5 previous attempts had gone haywire. I am keeping my fingers crossed. Hopefully the new plotter preferences fixed it. We shall see.
THANK YOU!
SOLVED
The original file that started this whole thing now cuts. I had thought the plotter preferences were just so much fluff and that only the COM settings really mattered. I am corrected. Now its all working, (except the contour cutting, (but that's another story).