The format for Flash Catalyst projects changed in version CS5.5. When you open a file that was created in Flash Catalyst CS5 in Flash Catalyst CS5.5, you get a message offering to convert the file to the new format. In the case of most of the lesson files that come with the Flash Catalyst Classroom in a Book, this is a quick, straightforward process. Once it's completed, simply save the converted file with a new name, and you can continue working on the lesson.
A few of the lesson files, however, do not convert successfully. Adobe Press has provided new versions of those files that have been rebuilt in Flash Catalyst CS5.5, and should open without mishap. Otherwise, they are identical to the files provided with the book. Adobe Press apologizes for any invonvenience.
You can download the updated lesson files from the Peachpit website. If you don't already have a Peachpit account, you will need to create one (simply supply an email address, name, and password; you do not need to enter a member code or ISBN number):
Download the updated lesson files
