So try
MT Manager app, it works with both not rooted & rooted devices, with rooted devices it allow more features obviously, but clone feature don't needs root, for clone an app touch/press it into mt manager, after it will appear a menu window with app info and 3 options at the bottom, then select "function" option>apk clone, then switch to old cloning method (since new one is vip feature) and you're done, after it just wait for the app cloning, but i repeat that this method will work just with simple coded apps, will not work with apps such youtube, spotify, whatsapp, and games obviously.