OK, guys, here is the answer. Yes, this can be upgraded to Exposure 4. This copy of Exposure 2 has not been registered and is complete with the Registration Code, Production Batch, and Quick Start Guide. The CD is Version 2.0.1, Windows and Macintosh compatible.
John: Any digital file that can be imported into any imaging software program, such as Photoshop for example, will work with this Alien Skin plug-in.