Unpacking Error on Upgrade to WP 2.8.2

I’m attempting to use the automatic upgrade facility for 2.8.2. I continue to get the following error message while attempting to upgrade. I’ve seen similar posts on the forum, but not exactly sure how to attack the problem.

Thank you, Ronnie

Downloading update from https://www.ads-software.com/wordpress-2.8.2.zip.

Unpacking the update.

Incompatible archive: PCLZIP_ERR_BAD_FORMAT (-10) : Invalid archive structure

Installation Failed