How to upgrade my Itunes to 11.1 on windows 8?

I tried to download music to my Iphone lately and as I load Itunes it says it can't use my phone because I don't have the latest version of Itunes. How do I upgrade my Itunes?

If you have an older version of iTunes running on your computer, go to the Help menu and check for updates. It will take a few moments, and then should tell you if there's a newer version of iTunes available. From there, you just click install/OK and let it download the updated program. Or, you can go to apple.com/itunes and download the newest version of the software from there.

To download the latest version of iTunes.

1) Launch iTunes, Press the Alt key on your keyboard, the menu bar will appear, now Click on the Help Menu

2) Click on "Check For Available Updates" and make sure you're connected to the Internet.

OR

You could just type in "Apple Software Update" in your start menu and click on the program to bring up the window that checks for available updates on all Apple programs on your computer.

Or you could just download the latest version here.

32-bit: http://www.filehippo.com/download_itunes_32/download/192ae91f222ed678749f82f8cb0869ff/

64-bit: http://www.filehippo.com/download_itunes_64/download/f76530478b40f61daa8057b9b1f8275e/

I think you're saying your PHONE doesn't have the latest version, not your PC? You need to upgrade your phone to the latest iOS (7 for iPhone 4 or 5 but 6.1.3 for iPhone 3) go to settings>general>software update to check. Make sure your phone has a strong Wi-Fi signal and is plugged into the mains before starting an update. It wouldn't hurt to check your PC version too though!