I tried to do an "automatic upgrade" of my Akismet installation, but I am getting error messages. Here's the most recent message (I got a different message earlier, but I didn't keep a copy and recover it now):
Downloading update from http://downloads.wordpress.org/plugin/akismet.zip.
Unpacking the update.
Incompatible archive PCLZIP_ERR_BAD_FORMAT (-10) : Invalid archive structure
I don't know where to begin in trying to resolve this. I have done successful "automatic upgrades" of Akismet in the past. Any ideas?