I noticed there are a number of reviews for older versions saying it won’t run on the kid’s old iPad or old iOS or whatever. We had a similar problem the other direction (with the current version). It works OK on the iPads we have around, but when I had to loan my iPhone 6 Plus in a pinch (using Guided Access to protect my stuff!), we discovered it doesn’t work. The image is about 60% of full screen, and then the buttons don’t seem to work.