I use firefox on Windows 7 64. When I download the offline installer for plug-in based browsers from http://www.adobe.com/products/flashplayer/distribution3.html, it still gives me the installer for 11.5.502.149. The download link for internet explorer gives me the 11.6 installer, though. I'm afraid that the installer on your server was not updated properly.
I downloaded both of those this afternoon from two different locations and each one was 11.6. I suspect you're encountering a cached copy right now. Unless you've signed our distribution agreement, I would suggest using the links located on this page instead:
Thanks for your prompt reply. Unfortunately your download link still gives me the old installer. However, I was able to download the correct one from http://fpdownload.adobe.com/get/flashplayer/current/licensing/win/install_flash_player_11_ plugin.exe.