Windows 10 and Compatibility with Photo-Paint X6

Since the November updates to Windows 10, Photo-paint x6 has gotten terribly flaky. Specifically, the brushes don't follow the mouse, anymore, instead making big diagonal strokes across the image. Something to do with a HiDPI screen. I wrote to Corel support and have been told the x6 does not support Windows 10, but x7 does. I can't find any spec sheets that say that. Has anyone here been told that?