AutoRealm is an ancient program that works fine on Windows 10. I'm hosting it here for convenience, and at any rate, the developer seems to be long gone. It's hosted somewhere, not on his/her site. AutoRealm is fantastic for drawing quick continent shapes. I'll post an amazingly awful video tutorial on how to do that soon. It's also great for measuring along curving paths. Play with it a bit and you'll find it very useful. To create an image, File, Save As, Jpeg, specify a size. Go big, but make it a multiple of the screen resolution, or it will distort.