No, you can't download the application on the iPad because it was never created for a mobile platform. I have checked the official website and the FastStone Image Viewer is compatible only with Windows 7 (32 bit), Windows 7 (64 bit), Windows 8, Windows Vista (32 bit), Windows Vista (64 bit), Windows XP. There is no way to install it on the iOS system. Alternatively, use the APP Store and type "Image Viewer" then you can use other apps.