Asking me to download Unity Web Player when it's already installed?

I want to play 'Equilibrium' on my Browser, but it says I have to download Unity Web Player. So I installed it, reset my computer and my browser, reloaded the page and it still says I need to install it? How do I fix this?

Basically, it's installed on my Computer, but it still says I need to install it.

I've tried using many different Browsers, (Opera, Chrome, Mozilla Firefox, Internet Explorer, SimpleWeb etc.) so I don't want any answers suggesting that I do that, please?

Website: http://www.outlanderstudios.com/en/game