Finally iOS8 is released for all users but many are facing issues with memory while upgrading to iOS as strangely 1.1GB of update requires 5.8Gb free space on device which is breaking dreams of many who want to upgrade .So don't feel annoyed you don't need to free up space just upgrade your device using iTunes (Make sure you have latest version of iTunes) by following below steps.
You can check method to download latest version of iTunes from below link
http://support.apple.com/kb/HT5654
You can look into step by step instructions on updating iOS8 via iTunes on by clicking here .
- Install the latest version of iTunes on your computer.
- Plug in your device to your computer.
- In iTunes, select your device.
- In the Summary pane, click Check for Update.
- Click Download and Update.
You can check method to download latest version of iTunes from below link
http://support.apple.com/kb/HT5654
You can look into step by step instructions on updating iOS8 via iTunes on by clicking here .