How do I update to iTunes 11.1 on Windows 8?

I have a Toshiba Satellite C855D-S5354 with Windows 8. The only way I was ever able to download iTunes was through an app(?) called Pokki. (It's a Windows 8 Start Menu) I believe I have version 11.0.5.5, but I can't sync my iPhone 4 with that, which is why I need to update iTunes. I have tried to install it from the iTunes website (in and out of compatibility mode, as and not as an administrator) and I just get this after trying to open the download:
I have also tried to update from iTunes itself, I then get this:

Taken together, those messages are suggestig that the istallers are gettig damaged during the download.
I'd first try downloading an installer from the Apple website using a different web browser:
http://www.apple.com/itunes/download/
If you use Firefox instead of IE for the download (or vice versa), do you get a working installer?

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