zip problems

[Richard Bram]

I am having such problems getting zipped files to customers ; it's
driving me crazy.
About 5 to 10% of the people that download my files are complaining
that the .prc file is corrupted. I'm making the zipped files using
Zipit on the Macintosh, and it contains two programs. I verify it
myself (about a hundred times) and it is fine.
Anybody know how to make sure people can download a zip file correctly?

Rick Bram