Having issue playing the video from dropbox

i have uploaded a video from the dropbox.

I get a message saying to update the browser or update the flash plugin to view the video.

I updated both but still video does not play.

Here is the link

http://www.chelmsfordsaicenter.org/index.php/2016/06/15/hari-subramaniam-on-devotion-must-watch/?preview_id=1234&preview_nonce=5390a27c42&preview=true

i have enabled the support access. Please help.

website: http://www.chelmsfordsaicenter.org