I often get unpacking errors when downloading Folders from windows onto a Mac. The folder is received as a zip file. Ezshare zips files on the fly on the server side. It only happens with some folders but then consistently with them. So downloading again won't help.

EZShare on Windows
Downloading with Firefox on Mac
Unpacking with BetterZip 5.3.4 gives Header Errors and unpacking results in additional folders.
Unpacking with System integrated Archive Program works without errors being displayed.

Unclear if there is some incompatible Header which System Tool ignores and BetterZip complains about or an error on BetterZIP side.