I would highly suggest everyone to always download itunes from the official itunes link or from Apple’s website. Always keep itunes updated. Because the latest version of itunes you will not able to update to idevice to the latest ios version. Apple won’t ever let you update your iPhone to latest ios if your itunes is not update.
Download Latest version of iTunes for Windows/Mac for free –
Keep always itunes updated. If you have itunes already installed in your pc then simple open Apple Software update in your pc and update your itunes to the latest version.