Trying to update Iphone to IOS 6.what's happening

Whenever i go to the site to download the new version IOS 6
it never donwload and give me error.been trying for 2 days now?! What's the deal
http://appldnld.apple.com/...r4/iPhone3, 1_6.1.3_10B329_Restore.ipsw
http://www.spiritjb.org/2013/03/ios-6.1.3-firmware-direct-download-iphone-ipad-ipod.html

My Iphone is Iphone4 (GSM)

Added (1). I tried throught ITUNES too it never worked thats why i went to download and install it manual!

You can't download IOS 6.1.4 to Iphone 4, that's Iphone 5 excusive. If your'e installing something earlier. Try restarting the Iphone AND your computer first. (Don't restore manually. It won't work that way)

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