Ive had it working on mine for ages now, but I didnt download it from the above link so cant comment on it.
CRC_K contains the checksum for the vxworks kernel, so if its not there the flasher program cannot flash the image as it doesnt know if its corrupt or not.
The question is, is the CRC_K file actually on the CD you have burned?
If not re-download it or download it elsewhere, and try and burn at the lowest speed possible.