If you are trying to update the software and it is not updating then this instruction page will guide you step-by-step. Your apple device comes with iOS (operating system) and apple releases updates to ensure stable performance and bug fixes. Just follow the below mentioned steps and learn how to update software through iTuneson your iOS device.
Step 1: Firstly, it is recommend performing a Soft Reset. Press and hold Home & Power button simultaneously until you see apple logo. Make sure that your iOS device is connected with internet.
Step 2: Connect your iOS device to Mac computer. Check if iTunes is updated or not. If not, then update it. Try disabling antivirus on computer. After updating the software, you can install the antivirus again.
Step 3: If still software is not updating and showing some errors, Re-install the iTunes (in case of downloading iTunes go towww.apple.com/itunes). Download the file and install the iTunes. You can now update software through iTunes.