@akhil88: Do you get any notifications or error messages when you attempt to download the app? I can't imagine that it's a storage issue, as this would be flagged by the Play Store when you attempt the download. Try heading to Settings > About Phone > Software information > Google Play system update to ensure you're on the latest version, then head to the Play Store > Tap your profile in the top right > Settings, and check your Network preferences and Authentication options, just in case you're being restricted in this manner.
