Microsoft released AutoCollage 2008 under a "try-before-you-buy" shareware model. Users could download a free 30-day trial version from the official Microsoft Research website. The Watermark Limitation
Since the software is no longer for sale, you cannot officially purchase a new 25-character product key from Microsoft.
There are several ways to obtain a 25-character product key for Microsoft Research AutoCollage 2008:
is a discontinued graphics application that used advanced computer vision to automatically blend a collection of photos into a seamless collage. Status and Availability