Confused about iTunes version 11.1

So I just downloaded the iOS7 on my iphone 4 and want to download some music from my iTunes on my PC to my phone but itunes says I need to download version 11.1 for it to recognise my phone? How do I download it? And does it mean download it to my PC or my phone? Please help! Preferably before tomorrow! Xx

Added (1). I have tried to download it 3 times already but nothing seems to happen/I can't find the software on my computer…

You have to download it on your computer. Goto itunes.com and click the blue download button.

For your computer from here…

http://www.apple.com/.../download/

Hi, I downloaded from the web site FileHorse for 32 and 64bit:

http://www.filehorse.com/download-itunes-32/
http://www.filehorse.com/download-itunes-64/

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