Had been having directory permission issues -- on GoDaddy/windows hosting ... but believe that those are now resolved.
Now, when I try to install ZIP, it answers:
There was an error installing your premium extension - Your have exceeded the maximum download count for a single website.
Am not sure if it is a different error, or the WPB2D just wont send me the installable anymore. Is there a way to manually download and install the ZIP extension?