Is distribution-1.8.2-designer-linux64bit.zip corrupted?

I am trying to install Designer on Ubuntu so clicked the linux 64 bit download link from http://www.openhab.org/getting-started/downloads.html which downloaded
https://bintray.com/artifact/download/openhab/bin/distribution-1.8.2-designer-linux64bit.zip

Unfortunately this appears to be corrupted as it will not open in the Ubuntu archive manager or command line unzip. It shows as not valid on a windows system also. I downloaded it twice so not a problem during the download operation.

Has anyone got any suggestions?