I'm on the page http://google.com/chrome/browser/desktop/index.html
There is a large blue button "Download Chrome" and below it "For Mac OS X 10.6 or later".
I click on the button. Result: the whole screen goes gray, and all links are de-activated, like a "lightbox" effect, and nothing else?!
Safari Version 8.0 (10600.1.25) On a Mac OS X Yosemite Version 10.10 iMac 27-inch