Unable to unzip ios-sim-1.3.zip

[kellyfj]

I am using Mac OS X 10.9.2

kellyfj@/usr/local/ios-sim$ curl -L https://github.com/Fingertips/ios-sim/zipball/1.3 -o ios-sim-1.3.zip
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  221k  100  221k    0     0   231k      0 --:--:-- --:--:-- --:--:--  231k
kellyfj@/usr/local/ios-sim$ unzip ios-sim-1.3.zip 
Archive:  ios-sim-1.3.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 ios-sim-1.3.zip or
        ios-sim-1.3.zip.zip, and cannot find ios-sim-1.3.zip.ZIP, period.
kellyfj@/usr/local/ios-sim$ zip --version
Copyright (c) 1990-2008 Info-ZIP - Type 'zip "-L"' for software license.
This is Zip 3.0 (July 5th 2008), by Info-ZIP.