[Xastir] get-NWSdata failure

[Dan Srebnick]

I ran the get-NWSdata script today after someone mentioned to me that
it was not working for him.  I received the following error:

Archive:  c_11au16.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 c_11au16.zip or
        c_11au16.zip.zip, and cannot find c_11au16.zip.ZIP, period.

Can someone knowledgeable please take a look?

Thanks.