There is only 1 upgrade, but I performed it on several computers.
It's a free upgrade for everyone running Windows 8.0. If you login as an Administrator, just go to the Store app (from the Start Screen), and you will see it waiting to be installed.
It can take awhile to download about 3.7 GB of software (on each machine), so allow at least 2 hours, depending on download speed and the computer's CPU. After the upgrade has completed, each user will need a few minutes more the first time they login, as settings are configured for the first time.
Overall, it's not a major change, but its improvements are welcome. For example, you can create groups of Start tiles and name them, for better organization. You can also press the down-arrow icon below the tiles to see all apps installed. You can even boot directly into the desktop, or use its wallpaper on the Start Screen. The Start Menu appears on the Desktop, but it mainly toggles back to the Start Screen (instead of launching programs, as in previous Windows versions).
As with Windows 8, one of the best enhancements is the ability to sync settings across computers. When you configure preferences (such as wallpaper, or even accessiblity), they are linked to your Microsoft-based ID and take effect on any PC you use (assuming your ID on that PC is linked to Microsoft's system).
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