I thought when I bought this that it would be a light version of Photoshop
Adobe Photoshop Elements is more what Adobe sells as a "light version of Photoshop". (I don't know what the system requirements are.)
Nevertheless, I think Lightroom would have been a good choice if it would run on your uncle's computer. Although not a "light version of Photoshop", it contains the same technology as Camera Raw. Unless your uncle wants to create artwork, do compositing, etc, Lightroom is a fantastic and relatively inexpensive alternative to Photoshop. In addition, or rather primarily, it is a powerful database image management system.
