The problem is that he has the zip files archived in small amounts. The secondary files are just not downloading. I think, but not sure, that the extensions (E.I. filename.r01 ,etc.), are not a recognized mime type on the server he has them loaded up to. Most of these files if people don't realize - obj, Cr2, Pp2s, and a like, will transfer nicely as a plain text file. If they happen to be using a restrictive but free hosting web site, all they need to do is tell the user to change the extension after they have download it.