Subject says it all really, when I try to unzip the latest version I get an error

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.

I notice also the latest version is only 327.5 kb while previous versions are up to 47 Mb.

Cheers Wayne