After installing, Snap Art 3 can be found in Photoshop’s menu Filter>Alien Skin.
In the past we gave each product it’s own menu, such as Filter>Alien Skin Snap Art 2. We did that because our products each consisted of many filters, like 10, 14, or even 30. Putting them all in one menu would have jumbled them together in one huge alphabetized list.
These days we are moving toward single filter products. For instance, Snap Art 3 went from 10 filters down to 1. As we do major updates, most products will become single filters and will move into Filter>Alien Skin. It will take a while, but eventually your Photoshop Filter menu will be more tidy.