You realize that it says the version right on the top, right? And in the Copyright notice. Heck, that one even says when it was released (May 17, 2013 for this build).
Try downloading it and running it.
I haven't seen any other mention of this, or see anywhere else to put it really. But the new web site's current nightly .exe build is using 16.0 r12585, where as the current revision is 16.8 r15750.