Two things: They didn't come because the zip file wouldn't turn into a cdp file
What is up with the (ten letters) thing
Most likely they are in the file format. Simply hit the 'extract' button and put the files into a folder, then open the CMP, and use the 'import content' button and select the folder that you saved it to, the cars will then be loaded.
ten letters, because the forum does not allow posts under 10 digits, and seeing that I only posted 'how so' it would have not let me post unless I met that requirment,
cheers