Apple newest operating system iOS 10 is available for their mobile devices like iPhone and iPad which is support and compatible with iPhone 5, iPhone 5s , iPhone 6, iPhone 6 Plus and it will also support upcoming Apple iPhone 7. Apple Support only iOS files for their devices apple released soon its latest iOS 10 for iPad and i phones.
Apple iTunes has similar games and apps like google android play store. You can download games and application from their as well but if you want to download complete setup file you can download download it easily.
Apple iOS Software :-iOS 4.0