That's an older version. I apologize. I asked you to run the wrong command. Run $ReleaseNumber instead. It should say "2" for version 10.0.2 which is the latest release.
If you get Mathematica directly from Wolfram Research, you most likely can get it from user.wolfram.com after logging in. Some universities have a different distribution system. If you run into any problems downloading 10.0.2, I would suggest contact Wolfram Customer Support (http://www.wolfram.com/support/contact/).
Which version of Mathematica are you running?
To find out, evaluate $Version. If you're not running the latest version, I would suggest trying to install the latest version.
I'm using 10.0 for Microsoft Windows (64-bit) (June 29, 2014). Is that the latest version?
It worked for me... not a very informative image though....
The error that you got can come from a file that is not properly formatted JSON, which, of course, could be anything that is returned when, for example, an error web page is sent.
