HT4623 Unable to update to iOS 7.0. Error displayed "Software Update Unavailable"

I have an iPhone 4. I was able to download iOS 7 but it did not install. Now when I try to install it and error is displayed "Software Update Unavailable"

Have you tried to update via iTunes or via Wifi?  Here is the article on how to do both - http://support.apple.com/kb/ht4623
Tell us what it's telling you when you try if you are having issues.
Some common things to try if you are having issues doing it over wifi:
1) Turn on Airplane Mode in Settings.
2) Turn the iPhone off completely for about 2 minutes by holding the power button and sliding the red bar.
3) Turn the iPhone back on and turn off Airplane mode from Step #1. Try to update again.
4) Go to Settings > General > Reset > Reset Network Settings. Then reconnect to your Wifi and try to update again.
If you are getting an error about space, you can delete some apps or information to free up space on your iPhone (You can view what's taking up space in Settings > General > Usage) or you can update via iTunes on the computer. http://support.apple.com/kb/ht4623

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