Not so long ago I attmepted to update the plugins that power by WordPress blog, when I got this error message.

The package could not be installed. PCLZIP_ERR_BAD_FORMAT (-10) : Unable to find End of Central Dir Record signature

I attempted to retry update, and it failed again every time with the same error.

Stack Overflow gave this advice:

I’ve increased the upload_max_filesize, post_max_size and memory_limit as well. But still I’m getting the same error.

But in my case it was something different - my server ran out of disk space, and a corrupted zip file was downloaded.

But how to fix it?

WordPress saves the plugin packages into the temp directory of the server, so all I had to do was open the temp directory, delete the corrupted file, free up some extra disk space, and then retry the plugin update.