https://askubuntu.com/questions/54904/unzip-error-end-of-central-directory-signature-not-found

Archive: upload.zip End-of-central-directory signature not found. Either this file is not a zipfile, or it constitutes one disk of a multi-part archive. In the latter case the central directory and zipfile comment will be found on the last disk(s) of this archive. unzip: cannot find zipfile directory in one of upload.zip or upload.zip.zip, and cannot find upload.zip.ZIP, period.

The problem is exactly what it says. Unzip can’t find the line of code that signals the end of the archive, so either:

The archive is corrupt.

It is not a .zip archive.

There are more than 1 parts to the archive, but that doesn’t seem possible to me. You should try the other mirror too. It worked for me.

P.S. Notice how the program is made for Windows. So you need Wine (from http://www.winehq.com or the Ubuntu Software Center) to run it.