In the end, I solved it simply by using the Longbow solution and followed their instructions for installing LT 2000 on Windows 10 64bit - points to note: I had no setup issues at all, Properties is working perfectly, MText also not crashing. All commands are running as far as I can see. I note plotting worked straight out the box using Longbow. Cost some $ but recommended as they were very responsive to my questions and got me running very quickly on my brand new Surface Pro Windows 10