I finally gave up on Toolbox. For me it clearly doesn't work with Win10. In fact it won't even install anymore. I now have a working scanner in my D530 Laser printer/scanner because I uninstalled the printer and had Win10 reinstall it, not using the orginal CD. I do lose FAX but I can live with that. Presto Pages now manages my scanning so I don't go through MF Toolbox.
What irriates me is that if we judge from the participation on this thread there is a significant number of owners of Canon MF devices that have a serious problem that Canon won't address. As I said in my previous post the CS rep that "helped" me on the phone just wanted me off the phone so he out and out lied. Having given me a 'solution' he could now mark that problem as 'solved', thus showing his superiors that there is no problem. This strategy is not limited to Canon, of course, and it makes managing technology for the average person, like me, very difficult. In any case my next device defintely won't be Canon.