I have tried repeatedly to view the tutorials. I have updated to latest version of Quick Time and get one of two messages:
A progam is missing and not on this server
Required compressor not present
Searched Google and downloades a Codec Compressor, but still no view.
Tried to view with DiVx and got error message:
File does not appear to have Video
I don't know if this is your problem or not--but when the zip file is decompressed, you will find 2 files named the same--as in the Intro in the first zip---there are 2 files with the same icon--both Quicktime Movies, etc.--BUT--the first will give you an error (mine was about the same as yours) and the second one is the one that runs--the first is 70 bytes and the second is 64.4 MB. So--check your folder and right click for the properties and try running the one with the 64.4 MB (if this is C2P--1-3, and all the rest of the series)
Hope this helps--it mystified me for a bit.