Also stuffit is less common on Windows - a plain ZIP file would be good - my PC is throwing up errors on the first 3 downloads.
Camera to Print video files come, as far as I know, in plain ZIP format, you should have no problem to unzip them. Are you sure that the files are fully downloaded (no time-out connection)?
Sizes on my Mac are as follows:
CameraToPrint_01-03.zip 290,228,783 bytes
CameraToPrint_04-06.zip 326,311,305 bytes
CameraToPrint_07-09.zip 350,779,873 bytes
CameraToPrint_10-12.zip 247,442,686 bytes
CameraToPrint_13-15.zip 237,692,346 bytes
CameraToPrint_16-20.zip 283,313,256 bytes
CameraToPrint_21-24.zip 468,362,831 bytes