This may have resulted from an incomplete download.
What we recommend is that you re-download the installer file using Google Chrome or Mozilla Firefox.
If you are already using those browsers, we suggest that you clean your browser's cache prior to re-downloading.
If you're not sure on how to clear your browser's cache, kindly check the link below for a more detailed instruction.
http://www.wikihow.com/Clear-Your-Browser's-Cache
Thank you.