The iTunes software assists in managing your music and video libraries and lets you control what material you want on the iPod. iTunes also keeps your iPod software up to date so that you can benefit from improved/new features found in the latest software.
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iTunes U is a section of the iTunes Store where users can download educational content from many universities.
You need to download the iTunes software
To determine the version number of any Mac OS X software click on the name of the software (for example iTunes) in the menu bar (top left) and select About iTunes. This will open a window with details about the software. If the software is not running you can right click on the software's icon and then select Get Info from the menu. This will open an Info window with details of the software.
New iTunes software can be installed to update the previous version. Only the iTunes software is updated the iTunes library with your music/videos etc. is not affected by the update.
Yes, you can. If you download the iTunes for PC from Apple.com, you can download songs and movies off of iTunes on a PC.
Remove iTunes, then use another iPod managing devicings!
iTunes
Only the iTunes software is updated your music library will not be touched by the update.
You can download as many copies of the iTunes software as you desire.
iTunes software is already free for download at Apple.com.