If you already have iTunes installed on your Windows computer then you may get prompted every few months to update your version of iTunes. Follow the steps below to understand the iTunes update process.
iTunes will ask you if you want to download the latest version of iTunes when a new version is released. If you click on Download iTunes it will download the latest version and install it for you.
Select the software updates that you want to install and click on the Install button to proceed.
The Apple Software Update program will download iTunes to your computer. Depending on your internet connection speed the download may be fast or may take a while.
After the update has been downloaded it will install it for you.