Tom,
If you’re using Windows, you can right-click an image in a web browser and save it to your local disk. On an iPhone/iPad, you can press and hold to do the same thing. If your post has many images, that can get tedious. On Windows, there should be a command in the browser’s File menu that saves an entire web page, including its images, locally. If you use that command, you can just collect the saved images afterward.
If it takes your grandson too long to visit, I can help you move your jig project over, sending you step-by-step instructions. I seem to remember someone (or several someones) posting such instructions here. Maybe it was LittleBlackDuck. I can’t seem to find them at the moment. I’ll look more and reply here if I find them.
Ron