How do i manually update my itunes?

I updated my ipod touch on someone elses computer..

But when i wanted to sync my ipod into my iTunes, it told me that i would have to update it..

and soo I did but when I was almost done, it stoped downloading and told me that I would have to manually update my iTunes..

 

I need to upgrade it to 10.2.2

(my current iTunes is version 9.2.0.61 ...I dont regulary update >x<)

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